Chegg Are Household Electrical Outlets Connected in Series or Parallel? How Do You Know?
Electric Circuits Review
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Function B: Multiple Option
8. If an electric excursion was analogous to a water park, then the battery would be analogous to the ____.
a. pipes which deport the water through the h2o circuitb. pump which supplies energy to move the h2o from the ground to a high height
c. the people which menses from the tiptop of the h2o ride to the bottom of the water ride
d. the charge per unit at which water is pumped onto the slide
e. the change in potential energy of the riders
f. the top of the water slide
g. the bottom of the water slide
h. the long lines which exist at the park
i. the speed at which riders move as they slide from the superlative to the lesser of the ride
Reply: B
A water ride at a water park is analogous to an electric circuit. First of all, there is an entity which flows - water flows in a water park and (in conventional terms) + charge flows in an electric circuit. In each instance, the fluid flows spontaneously from a high free energy location to a depression energy location. The flow is through pipes (or slides) in a water park and through wires in an electrical circuit. If the pipes or the wires are broken, then at that place can exist no continuous menses of fluid through the circuit. A complete loop is required to establish the circuit.
This catamenia of fluid - whether of water or charge - is possible when a pressure difference is created between two locations in the circuit. In the water park, the pressure difference is the departure in h2o pressure created past two locations of different heights. Water flows spontaneously from locations of loftier pressure (high altitude) to locations of low force per unit area (low distance). In an electrical circuit, the electric potential divergence betwixt the ii terminals of a battery or free energy source provides the electric force per unit area which presses on charge to move them from a location of high pressure (high electric potential) to a location of low force per unit area (low electric potential).
Energy is required to motion the fluid uphill. In a water park, a water pump is used to do work upon the water in order to enhance it from the low height back up to the high height. The h2o pump does not supply the water; the water which is already in the pipes. Rather, the water pump supplies the free energy to pump the water from the location of low energy and low pressure to the location of high energy and loftier force per unit area. In an electrical excursion, the battery is the charge pump which pumps the accuse through the battery from the location of depression electric potential energy (the - terminal) to the location of loftier electric potential free energy (the + last). The battery does non supply the electrical accuse; the charge is already in the wires. The battery simply supplies the energy to practise piece of work on the charge in pumping it uphill.
9. If an electric circuit was analogous to a water park, then the positive final of the bombardment would exist analogous to the ____.
a. pipes which comport the water through the water circuitb. pump which supplies free energy to movement the water from the ground to a high height
c. the people which flow from the top of the water ride to the lesser of the water ride
d. the rate at which water is pumped onto the slide
e. the change in potential energy of the riders
f. the tiptop of the water slide
g. the bottom of the h2o slide
h. the long lines which exist at the park
i. the speed at which riders move equally they slide from the top to the bottom of the ride
Respond: F
A water ride at a water park is coordinating to an electric circuit. Beginning of all, there is an entity which flows - h2o flows in a water park and (in conventional terms) + charge flows in an electric excursion. In each case, the fluid flows spontaneously from a high energy location to a low energy location. The flow is through pipes (or slides) in a water park and through wires in an electric circuit. If the pipes or the wires are cleaved, then in that location tin be no continuous menses of fluid through the circuit. A complete loop is required to establish the circuit.
This flow of fluid - whether of water or charge - is possible when a pressure difference is created between ii locations in the excursion. In the water park, the force per unit area divergence is the divergence in water pressure created past two locations of different heights. Water flows spontaneously from locations of high pressure level (high altitude) to locations of depression pressure (depression altitude). In an electric circuit, the electric potential difference between the ii terminals of a bombardment or free energy source provides the electrical pressure level which presses on accuse to move them from a location of high pressure level (high electric potential) to a location of low pressure (low electric potential).
Energy is required to move the fluid uphill. In a water park, a water pump is used to practise work upon the water in lodge to raise it from the low tiptop support to the loftier summit. The water pump does not supply the water; the water which is already in the pipes. Rather, the water pump supplies the free energy to pump the water from the location of low energy and low pressure level to the location of high energy and loftier force per unit area. In an electrical circuit, the battery is the accuse pump which pumps the charge through the battery from the location of low electrical potential energy (the - terminal) to the location of high electrical potential energy (the + terminal). The bombardment does not supply the electric charge; the charge is already in the wires. The battery merely supplies the free energy to do work on the charge in pumping information technology uphill.
10. If an electric circuit was coordinating to a water park, and so the electric current would be analogous to the ____.
a. pipes which deport the h2o through the water circuitb. pump which supplies energy to motion the water from the footing to a high tiptop
c. the people which flow from the top of the water ride to the bottom of the water ride
d. the rate at which h2o is pumped onto the slide
e. the change in potential free energy of the riders
f. the top of the water slide
g. the bottom of the water slide
h. the long lines which exist at the park
i. the speed at which riders move every bit they slide from the superlative to the lesser of the ride
Reply: D
The period of water at a water park is analogous to the menses of charge in an electric circuit. The rate at which charge moves past a point on a circuit every bit measured in Coulombs of charge per second (or some comparable set of units) is known as the electric current. In our illustration, the fluid which flows is water and the charge per unit at which the fluid passes any given signal is the current.xi. The potential energy possessed per unit of measurement of accuse at whatsoever given location is referred to as the electrical ___.
a. current
b. resistance
c. potential
d. power
Answer: C
This is the definition of electric potential - a concept you should internalize.
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12. Ane ampere is the amount of current that exists when ____ flows by a certain point in a usher in ____.
a. i watt; one 2d
b. ane joule; ane hour
c. 1 electron; ane 2nd
d. one electron; one hour
e. one volt; 1 2nd
f. one volt; one hour
grand. one coulomb; one 2nd
h. one coulomb; i hour
Respond: Chiliad
An ampere is a unit of measurement of electric current. And electric electric current is defined as the rate at which charge moves by a point on a excursion every bit measured in standard units of Coulombs of charge per second.
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thirteen. If vi coulombs of charge flow by point 'A' in a circuit in 4 seconds, then ____ coulombs of accuse will menstruation past bespeak 'A' in eight seconds.
a. 0.67
b. one.5
c. ii
d. 3
e. 4
f. six
g. eight
h. 12
i. 24
Answer: H
The current (I) is the quantity of charge flowing past a signal (Q) in a given corporeality of time (t). That is, I = Q/t. So in this case, the current at indicate A is (six C) / (4 due south) or 1.5 amperes. Thus the Q/t ratio is 1.5 regardless of the fourth dimension. And then solve the equation
for Q to obtain the reply.
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14. In which of the following situations will the light seedling light? List all that apply.
Answer: DF
For a circuit to exist established, there must be a closed conducting loop from the positive terminal to the negative terminal. This would mean that circuits D, E and F would all be circuits. Only in order for the lite seedling to light, it must be included as part of the electrical circuit. So in E, the bulb does not calorie-free since the loop does not extend upward into and through the light bulb; charge would elementary flow out of the + terminal bombardment and directly back into - terminal the battery.
A simple circuit containing a battery and a lite bulb is shown in the diagram at the correct. Use this diagram to answer the next several questions.
xv. The current through the battery is ___.
a. greater than that through the light bulb
b. less than that through the light bulb
c. the same as that through the calorie-free bulb
d. greater than that through each wire
e. less than that through each wire
Answer: C
Accuse is a conserved quantity; it is never gained nor lost. In an electric circuit, the charge present in the wires and conducting elements is what moves through the excursion. This charge is enclosed in the wires and unable to escape (assuming there is no fault in the circuit). As the charge flows, information technology does not accumulate in a given location. And charge is not used up as though it were a consumable quantity. Nor is charge transformed into another type of entity. Given all this reasoning, i would conclude that the current at one location in an electric circuit is the same as the current at any other location in an electric excursion.
sixteen. Charge flowing through this circuit is well-nigh energized at ____. Cull the i best answer.
a. the + concluding of the batteryb. the - terminal of the battery
c. just prior to entering the calorie-free bulb
d. but after exiting the lite bulb
e. ... nonsense! The energy of the charge is the same everywhere throughout the circuit.
Answer: A
The + final of the bombardment is the high energy terminal of the battery.
17. The function or purpose of the battery in this excursion is to ____. Choose three.
a. supply electric charge then that a current can existb. supply energy to the charge
c. motility the accuse from the - to the + concluding of the battery
d. transform energy from electrical energy into light energy
due east. constitute an electric potential difference between the + and - terminals
f. furnish the charge which is lost in the light seedling
g. offer resistance to the flow of accuse and then that the low-cal bulb can get hot
Respond: BCE
To constitute an electric circuit, charge must be moved from low energy to loftier free energy. Once at high energy, the charge spontaneously flows through the conducting wires and other conducting elements of the circuit back down to the depression free energy last. A bombardment'southward function is to supply the energy which is required to motion the charge from the - terminal to the + terminal of the battery. By placing a big quantity of like accuse at ane location, an electrical pressure or potential deviation is established, forcing the like charges to motility abroad from this location to the location of opposite accuse (the - terminal).
18. A 12-Volt battery would supply ___. List all that apply.
a. 3 Coulombs of charge with 4 Joules of free energyb. 4 Coulombs of accuse with 3 Joules of free energy
c. 12 Coulombs of charge with 1 Joule of energy
d. ane Coulomb of charge with 12 Joules of free energy
e. 0.5 Coulombs of charge with 24 Joules of energy
f. 24 Coulombs of charge with 2 Joules of energy
Respond: D
Electric potential (or voltage) is divers equally the electric potential energy per charge. It is the Joules of energy per coulomb of charge possessed by some quantity of charge at some location in an electric excursion. A 12 Volt bombardment moves some quantity of accuse from the - final to the + terminal, giving the charge free energy. Each coulomb of charge would acquire 12 Joules of free energy. The energy/charge ratio would be 12 J/C.
xix. The charges that flow through the wires in your domicile ____.
a. are stored in the outlets at your homeb. are created when an appliance is turned on
c. originate at the power (energy) company
d. originate in the wires betwixt your dwelling house and the power visitor
e. already exist in the wires at your home
Answer: E
This question targets a common misconception about electric circuits. The misconception presumes that the role of the electrical outlet, the battery, or the power company is to provide the charge required to motility through the home. But the power company is only the source of the energy required to set up the charge in move past the establishment of an electric potential difference. The charge itself is present in the wires and conducting elements of your dwelling in the form of mobile electrons.
20. Approximately how long would it have an electron to travel from the battery of a car to a head light and dorsum (complete loop)?
a. seconds
b. hours
c. years
d. one-millionth of a second
e. one-tenth of a 2nd
Answer: B
Electric charge drifting through an electric circuit moves at a rather tedious pace. Quite surprising to many, the altitude traversed per unit of time is on the order of 1 meter per hr.
21. The electrical circuit shown at the right consists of a battery and three identical light bulbs. Which of the following statements are true apropos this excursion? List all that utilize.
a. The current through point 10 will be greater than that through point Z.b. The current through point Z will be greater than that through point Y.
c. The current will be the same through points 10, Y and Z.
d. The current through point X volition be greater than that through betoken Y.
e. The current through indicate Y will exist greater than that through point X.
Answer: C
As discussed in Question #xv above , the current in an electric circuit is everywhere the same. And so the current at these iii locations is the same.
a. The electric potential difference between X and Y is more than than that between Y and Z.b. The electrical potential divergence between X and Z is more than that between Y and W.
c. The electric potential divergence betwixt X and Y is the aforementioned as that between Y and Z.
d. The electric potential departure betwixt X and Z is the same equally that betwixt Y and Due west.
e. The electric potential difference between Y and W is more than that betwixt Ten and Y.
Reply: DE
The electric potential deviation across a light bulb (or whatever resistor) in an electric circuit is simply the product of the electric current at that bulb multiplied by the resistance of the bulb. Each bulb has the same resistance (since they're identical) and the aforementioned current (since the current is everywhere the aforementioned). So the electric potential deviation beyond each bulb is the same. And the potential drop across any two consecutive bulbs is the same. And the potential drop beyond two bulbs would exist greater than that across one bulb.
a. Conventional current is directed through the external circuit from point X to Y to Z to Westward.b. Conventional electric current is directed through the external circuit from point Due west to Z to Y to X.
c. Conventional current is directed through the internal circuit from point W to signal X.
d. Conventional current is directed through the internal circuit from point X to point W.
eastward. The bespeak where charge possesses the least amount of electrical potential energy is indicate West.
Reply: ACE
The battery is referred to equally the internal circuit. Charge moves in the internal circuit from the - last to the + terminal (in the direction from W towards Z). The wires and light bulbs comprise the external circuit; accuse moves through the external circuit from the + last to the - terminal (in the management of X to Y to Z to W).
24. Voltage ____ an electrical circuit.
a. goes through
b. is expressed across
c. is constant throughout
d. is the rate at which charges move through
Answer: B
Voltage or electric potential is not a thing which moves. Thus, choices A and D are non the answers since they imply motion of voltage. And the voltage or electric potential of a charge is non something which is abiding throughout the circuit as choice C suggests.
Voltage or electrical potential is a measure out of how energized a quantity of charge is at a given location relative to the - terminal. Information technology is often expressed equally a difference across two points. Perhaps yous accept noted this language of "the potential beyond ..." in several of the answers in this Review.
25. Two or more of the post-obit words and phrases hateful the aforementioned thing. Identify them by listing their letters.
a. Voltage
b. Wattage
c. Electric Potential Difference
d. Rate at which charge flows
e. Electrical Pressure
f. Energy
Reply: ACE
The voltage or electric potential difference are synonymous terms. Voltage is not synonymous with energy. While voltage (or electric potential difference) is a mensurate of how energized a quantity of accuse is at a given location, voltage is expressed every bit the energy per accuse (and not simply as free energy). Drawing from the analogy between a water park and an electric circuit, voltage is a measure of the quantity of electrical pressure level placed upon a charge in inducing information technology to move from one location to another location.
Wattage is synonymous with ability. Current is synonymous with the rate at which accuse flows.
26. A loftier voltage battery can ____.
a. do a lot of work on each charge it encountersb. do a lot of work over the course of its lifetime
c. button a lot of accuse through a excursion
d. last a long time
Answer: A
Voltage refers to the energy/charge. A battery rated with a high voltage can do a lot of work per every Coulomb of accuse which information technology encounters. Information technology may or may not be able to do a lot of work over its lifetime, depending upon the size of the battery.
27. Which ane of the following occurs when a rechargeable battery is recharged?
a. The battery, which has run out of watts, has its wattage restored.b. The battery, which has run out of amps, has current placed back into information technology.
c. The battery, which has run out of charge, has charge returned to it.
d. The battery, which has run out of chemic reactants, has its chemicals reformed.
Reply: D
Batteries perform their energy-supplying tasks by using the energy from an exothermic oxidation-reduction reaction to practice work upon charge inside the electric circuit. When a battery no longer works, its reactants are consumed to the point that the electrical potential which the reactants are capable of producing is small compared to the overall resistance of the circuit. At such an instant in fourth dimension, the ability to induce a electric current is express to the betoken that the external circuit elements are no longer functional.
Not all batteries are rechargeable. Those that are rechargeable can accept the products transformed back into reactants. The recharger utilizes electrical energy from an outlet to reverse the previously exothermic reaction, turning its products dorsum into reactants.
28. Birds can safely stand on high voltage electrical power lines. This is because ____.
a. they are at low potential with respect to the ground.b. they offer no resistance to current.
c. they e'er choose power lines that are not in use.
d. the potential difference between their feet is depression.
e. they are perfect insulators.
f. they are perfect conductors.
Answer: D
In order for charge to menstruation between ii locations, there must be an electric potential departure established between those ii locations. If a bird places its left foot on an electrical power line and his correct pes a few centimeters away on the aforementioned electric electric line, and then there is trivial to no difference in potential betwixt his two anxiety. Without an electric potential difference, charge will non menstruum through the bird and the bird is safe.
29. When the light bulb in your lamp no longer works, it is because the bulb has _____.
a. run out of energy and can no longer pump chargeb. run out of voltage and must be recharged
c. run out of electrons and then there is no more current
d. burned all of its watts and can no longer shine
e. tripped a circuit breaker and must be fixed at the fuse box
f. a cleaved filament which has resulted in an open circuit
k. ... nonsense! The bulb is fine; your family but needs to fully pay their power bill.
Reply: F
The most common cause for the inability of a light bulbs to light is a broken filament. A coiled wire of tungsten stretches between two vertical supports. If disturbed while hot or if overworn, the tungsten metal can break and leave a gap between the two vertical supports. This gap represents a suspension in the circuit; a closed conducting loop is no longer established and charge will not menstruum.
30. A battery is needed in the excursion of your flashlight so that ____.
a. charge is provided to the wiresb. the energy of the light is balanced by the battery
c. an exothermic, calorie-free-creating reaction is possible
d. an electric potential deviation is maintained across the circuit
east. electrons are supplied in lodge to light the bulb
Answer: D
One of the roles of a battery is to simply establish a difference in electric potential between its two terminals. Charge at the high potential volition flow through the external excursion to the low potential location.
31. When you turn on the room lights, they light immediately. This is all-time explained past the fact that ____.
a. electrons movement very fast from the switch to the light seedling filamentb. electrons present everywhere in the circuit move instantly
Reply: B
Electrons motion very slowly from i location to some other location. Just once a circuit is closed, they start moving immediately. While electrons move well-nigh a meter or in an hour, the actual bespeak which tells them to first moving tin travel at the speed of calorie-free. So in one case the switch is turned on, a signal is circulated throughout the circuit to start the electrons marching. The electrons present in the filament of the circuit.
32. The drift velocity of mobile charge carriers in electric circuits is ____.
a. very fast; less than only very close to the speed of low-calb. fast; faster than the fastest car simply nowhere almost the speed of light
c. slow; slower than Michael Jackson runs the 220-meters
d. very wearisome; slower than a snail
Answer: D
Drift velocity is the distance which a charge moves per unit of fourth dimension. This value is very small since electrons movement very, very slowly. Moving at about 1 meter per hour, they are literally slower than a snail.
33. Suppose that the electric current in a typical circuit (DC) is large. This is an indication that ____.
a. the mobile charge carriers are moving very fastb. a large number of mobile charge carriers are moving forrad per 2nd
c. both a and b are truthful
Answer: B
Current (the charge per unit at which charge moves past a point on the circuit) and drift velocity (the distance a charge moves in a second) should not be confused (and often are). If a electric current is large, one can be certain of only ane thing: a lot of charges are moving forwards by a signal on the excursion every second.
34. Which of the following statements represent correct unit equivalencies? List all that apply.
a. ane Ampere = one Coulomb / second
b. 1 Joule = ane Volt / Coulomb
c. ane Watt = 1 Joule • second
d. 1 Watt = ane Volt • Coulomb / second
e. 1 Joule / Ohm = i Ampere • Coulomb
f. 1 Joule • Ohm = one Volt2 • second
Reply: ADEF
This question requires a noesis of both units for electrical quantities and the equations which relate those quantities.
In choice a, an Ampere is a unit of current (I) and a Coulomb/2nd is a unit of measurement of charge per unit of measurement of time (Q/t). This is consistent with the equation I = Q/t.
In selection b, a Joule is a unit of energy (Due east) and a Volt / Coulomb is a unit of voltage per unit of charge (V/Q). Since voltage is the energy per charge, we would expect that energy would be equivalent to voltage • charge. Thus, it is incorrect to equate units of free energy to units of voltage per charge.
In choice c, a Watt is a unit of power (P) and a Joule•2d is a unit of energy (E) multiplied by a unit of time (t). Just ability is energy / time and not energy • time so this is not a correct unit equivalency.
In choice d, a Watt is a unit of ability (P). On the right side, a Volt is a unit of voltage (V) and a Coulomb / 2nd is a unit of current (I). So since P = I • V, this is a correct unit equivalency.
In option eastward, a Joule / Ohm is a unit of energy per unit of resistance (E / R). An Ampere • Coulomb is a unit of current multiplied by a unit of charge (I • Q). Thus, the equation is suggesting that East / R = I • Q. This can be rearranged algebraically to say that E / Q = I • R. Since voltage is the energy per charge (E / Q), the equation can be rewritten as V = I • R. This is thus a correct unit equivalency.
In option f, a Joule• Ohm is a unit of free energy multiplied by a unit of resistance (E • R). A Volttwo / second is a unit of voltagetwo multiplied by a unit of time (Vii • t). So this equation is suggesting that Due east • R = Five2 • t. This tin can be rearranged algebraically to say that E / t = Vii / R. The right side of the equation is equivalent to power, so the equation tin be rewritten every bit P = 52 / R. Since this is a correct way of writing the power equation, the given unit equivalency is correct.
35. Which of the post-obit diagrams represents resistors continued in in series? List all that apply.
Answer: B
A and C stand for parallel connections as shown by the branching which occurs earlier and after the resistors. In that location is no branching in choice B and so information technology is a series connection of resistors.
36. These ii resistors are connected in ____.
a. series
b. parallel
c. neither
Answer: A
One tin start at the positive last of the battery and begin tracing their finger forth the wire. If there is ever a point where the wire comes to a junction and branches in 2 or more directions, and then the circuit has a parallel connection. Otherwise, it is a series circuit. In this diagram, at that place is no branching. Thus, it is a series excursion.
37. The electrical potential divergence (voltage driblet) beyond each resistor is ___ Volts.
a. 6
b. 12
c. 24
d. ... nonsense!. The electric potential deviation is dependent upon the actual resistance of the resistors
Reply: A
38. If a tertiary resistor (Rthree), identical to the other two, is added in serial with the start ii, then the overall resistance will ____ and the overall electric current will ____.
a. increment, increase
b. decrease, decrease
c. increase, decrease
d. decrease, increase
eastward. increase, remain the same
f. decrease, remain the same
m. remain the same, increase
h. remain the same, decrease
i. remain the same, remain the same
Reply: C
Increasing the number of resistors in a series circuit will increase the overall resistance of that circuit and cause the current to decrease. (The contrary is true of a parallel circuit.)
39. If a third resistor (Rthree), identical to the other two, is added in series with the first two, and so the electric potential difference (voltage drop) beyond each of the three individual resistors will ____.
a. increase
b. subtract
c. remain the same
Respond: B
Using the same reasoning as in Question #37, we can say that the charge will acquire 12 Volts in moving through the bombardment. It volition have to lose this 12 volts in three steps as it passes through the external circuit. Since at that place are now 3 voltage drops in the external circuit instead of the original two, each driblet must be smaller than before. So there will be a 4-Volt driblet through each resistor (instead of the original vi-Volt driblet).
The diagram at the correct shows two identical resistors - Rane and Rii - placed in a circuit with a 12-Volt battery. Use this diagram to respond the adjacent several questions.
twoscore. These two resistors are connected in ____.
a. serial
b. parallel
c. neither
Answer: B
Ane can starting time at the positive terminal of the battery and begin tracing their finger along the wire. If at that place is e'er a point where the wire comes to a junction and branches in two or more directions, and then the excursion has a parallel connection. Otherwise, it is a series excursion. In this diagram, there is some branching. In one case the charge reaches the branching signal, it will either laissez passer through the resistor in the left co-operative (Rane) or through the resistor in the right branch (R2). Thus, it is a parallel circuit.
41. The electric potential difference (voltage driblet) across each resistor is ___ Volts.
a. half dozen
b. 12
c. 24
d. ... nonsense!. The electric potential divergence is dependent upon the actual resistance of the resistors
Answer: B
Charge receives an increment in electrical potential of 12 volts when moving through the internal circuit (the 
42. If a third resistor (R3), identical to the other two, is added in parallel with the showtime two, then the overall resistance volition ____ and the overall current will ____.
a. increase, increase
b. decrease, decrease
c. increase, subtract
d. decrease, increment
due east. increase, remain the aforementioned
f. decrease, remain the same
thousand. remain the same, increment
h. remain the same, decrease
i. remain the same, remain the same
Reply: D
Adding an identical resistor in a dissever branch will provide more than pathways past which accuse tin can traverse through the loop of the circuit. This would exist the equivalent of adding some other booth at a price station on a tollway in parallel with an existing booth. Opening upward another lane for traffic will reduce the overall resistance and cause an increase in the car catamenia rate. The aforementioned occurs with charge in parallel circuits. More branches means less resistance and an increased current.
43. If a tertiary resistor (R3), identical to the other two, is added in parallel with the first two, then the electric potential difference (voltage drop) across each of the three individual resistors will ____.
a. increase
b. decrease
c. remain the same
Answer: C
The electric potential divergence across whatsoever co-operative is equal to the voltage of the battery. Adding a new co-operative can change the overall resistance and the overall current, only information technology does not alter the electrical potential difference across the bombardment nor across the branches.
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44. The resistance of a charge-carrying conducting wire will increase as the ____. Choose all that utilise.
a. length of the wire is increasedb. cantankerous-sectional expanse of the wire is increased
c. temperature of the wire is increased
d. voltage impressed across the ends of the wire is increased
due east. wire is placed closer and closer to the + terminal of the circuit
Respond: AC
Resistance of a wire increases with increasing length and (to a smaller extent) with increasing temperature. Increasing wire length increases the number of cantlet-accuse collisions and thus the corporeality of resistance. Increasing the temperature increases the resistivity of the textile and thus increases the overall resistance.
45. When plugged into a 120-Volt outlet, a lite bulb consumes 300 joules of free energy over a v 2d time flow. The power of the light bulb is ____ Watts.
a. 0.0167
b. 0.50
c. two.0
d. 2.50
east. lx
f. 600
grand. 1500
h. 7200
Respond: East
Power is simply the rate at which free energy is supplied to a excursion or transformed by a circuit. In this case, the power is the energy consumed per time.
46. A certain electrical circuit contains a battery, wires and a calorie-free bulb. If potential energy is gained by charges at the battery location, then charges lose potential free energy ____.
a. in the wires onlyb. in the seedling only
c. equally in the wires and the seedling
d. generally in the wires but a fiddling in the bulb
e. more often than not in the bulb but a lilliputian in the wires
f. nowhere
Answer: E
Charge will lose energy equally they pass through locations of resistance. When in series, locations of greatest resistance will transform electrical energy into other forms at a greater rate. And so energy will exist lost in the light bulb and in the wires to a much lesser extent.
47. A loftier resistance lite bulb and a depression resistance light bulb are connected in series to a half dozen-Volt pack of batteries. Which of the two light bulbs will smoothen the brightest?
a. They volition have the same brightness.b. The low-R seedling will shine more brightly.
c. The high-R bulb will shine more brightly.
d. There is no way to make such a prediction since bulb effulgence is independent of bulb resistance.
Answer: C
Since the ii light bulbs are in series, the same electric current (i) is experienced by each. The power will be given by the i2•R product. Since i is the same for each light bulb, the bulb with the greatest resistance will have the greatest power. And so the high-R light bulb will transform electrical free energy into light energy at the greatest rate and thus shine nigh brightly.
48. A high resistance lite bulb and a low resistance light bulb are connected in parallel and powered past a 6-Volt pack of batteries. Which of the two light bulbs volition shine the brightest?
a. They volition have the same brightness.b. The low-R bulb volition shine more brightly.
c. The high-R bulb will shine more brightly.
d. There is no fashion to make such a prediction since seedling brightness is indepenent of bulb resistance.
Answer: B
Since the ii light bulbs are in parallel, the same voltage drib (Five) is experienced by each. The power will be given by the i2•R production. Since Five is the aforementioned for each lite bulb, the bulb with the greatest resistance will take the lest current. Current is of the greatest importance in determining the power of the lite seedling since it is squared in the equation. So the low-R lite bulb volition have the greatest current and thus transform electric energy into light energy at the greatest charge per unit; information technology will shine about brightly.
a. increment the resistance of one of the bulbsb. increase the resistance of two of the bulbs
c. subtract the resistance of two of the bulbs
d. increase the voltage of the bombardment
e. decrease the voltage of the bombardment
f. remove 1 of the bulbs
Answer: CDF
The current in a series excursion (both total electric current and current through private resistors) is directly dependent upon the battery voltage and inversely dependent upon the total excursion resistance. This current can be increased by increasing the battery voltage. It can besides be increased by decreasing the total resistance. Removing a bulb would decrease the total resistance and decreasing the resistance of whatever individual bulb would subtract the total resistance.
a. increase the resistance of one of the bulbsb. increment the resistance of two of the bulbs
c. decrease the resistance of two of the bulbs
d. increase the voltage of the battery
east. decrease the voltage of the battery
f. remove ane of the bulbs
Answer: CD
Point P represents the location where the full current of this parallel circuit can be measured. The full current would vary straight with the full voltage and inversely with the full resistance. Increasing the bombardment voltage would increase the current at location P. Decreasing the total resistance would increase the current at location P. The total resistance can be decreased by adding some other resistor in a divide branch or by decreasing the resistance of whatever of the branches.
a. increase the resistance of seedling Xb. decrease the resistance of seedling X
c. increase the resistance of seedling Z
d. decrease the resistance of bulb Z
east. increase the voltage of the battery
f. decrease the voltage of the battery
k. remove bulb Y
Answer: CF
The current in bulb Z is dependent upon the voltage drop across bulb Z and the resistance of bulb Z. In equation course,
An increase in bombardment voltage would increase the voltage driblet beyond bulb Z (VZ) and thus provide a greater current through the seedling. A subtract in the resistance of bulb Z would too increase the current through the seedling. However, making a alter in bulb X or Y would have no issue on the FiveZ / RZ ratio.
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