Physics Principles and Problems 2009

Chapter 23: Series and Parallel Circuits

Chapter Test Practice

1

Which pair of options below would result in a greater reading on VB in the figure below?

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A)increase the battery voltage or decrease RB
B)decrease the battery voltage or decrease RB
C)increase the battery voltage or decrease RA
D)decrease the battery voltage or decrease RA
2
If you have a 90 V power source with a 30-Ω and 60-Ω resistor in series, what is the voltage drop over the 60-Ω resistor?
A)30 V
B)2 V
C)60 V
D)90 V
3

Which pair of options below would result in a lower reading on VB in the figure below?

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A)increase the battery voltage or decrease RB
B)decrease the battery voltage or decrease RB
C)decrease the battery voltage or decrease RA
D)decrease the battery voltage or increase RA
4
Two 240.0-Ω resistors are connected in parallel and placed across a 12.0-V battery. What is the current in each branch of the circuit?
A)0.0125 A
B)0.100 A
C)0.0500A
D)0.0250 A
5
What is the equation to find current in a series of three resistors?
A)I = V/(R1 + R2 + R3)
B)I = V/(R1 × R2 × R3)
C)I = V(R1 × R2 × R3)
D)I = V(R1 + R2 + R3)
6
A 20.0-Ω resistor and a 40.0-Ω resistor are connected in series to a 20.0-V battery. What is the voltage drop across the 40.0-Ω resistor?
A)18.7 V
B)13.3 V
C)6.70 V
D)30.0 V
7

In the figure below, if a third resistor were added to the circuit somewhere between resistors A and B, how would the reading on the bottom ammeter change, if at all?

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A)This cannot be determined without knowing the value of the new resistor.
B)It would decrease.
C)It would increase.
D)It wouldn't change.
8
What happens to lights in series if one goes out?
A)they all go out
B)every other one goes out
C)they flicker
D)they stay lit
9
In the river model for an electric circuit, the amount of water flowing through the river each second is the __________.
A)path
B)voltage
C)power
D)current
10

If in the figure below resistor D were added in parallel to the other resistors, how would the voltages across resistors A and B be affected?

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A)A's would increase; B's would decrease.
B)They would both increase.
C)They would both decrease.
D)They would both remain the same.
11
A 340-Ω resistor and a 550-Ω reisistor are connected in parallel. This group is then connected in series with a 180-Ω and a 120-Ω resistors. What is the equivalent resistance of the circuit?
A)210 Ω
B)550 Ω
C)420 Ω
D)510 Ω
12
Five lights of equal resistance connected in series will __________.
A)be equally bright.
B)be brighter the closer they get to the positive end.
C)flicker.
D)never light up.
13
A 1.5 V battery is attached to a 1.0-Ω resistor and a 2.0-Ω resistor in series. What is the current?
A)3.0 A
B)0.50 A
C)4.5 A
D)2.0 A
14

If another ammeter were placed immediately above the battery in the circuit of the figure below, which ammeter(s) would it read the same as?

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A)the one on the right side
B)the top one
C)all three
D)the bottom one
15
A 60-Ω resistor and a 30-Ω resistor are in parallel. What is the equivalent resistance?
A)90 Ω
B)20 Ω
C)2 Ω
D)30 Ω
16
If you have two lights in parallel and you add another identical light in parallel, what happens to the total current?
A)It remains the same.
B)It goes to zero.
C)It increases.
D)It decreases.
17
The equivalent resistance of resistors in parallel can be calculated by __________.
A)1/R = 1/RA + 1/RB + 1/RC…
B)1/R = 1/RA x 1/RB x 1/RC
C)R = RA + RB + RC...
D)R = 1/RA + 1/RB + 1/RC...
18

In the figure below, if a third resistor were added to the circuit between the bottom ammeter and the battery, how would the reading on the top ammeter change, if at all?

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A)It would increase.
B)It would decrease.
C)This cannot be determined without knowing the value of the new resistor.
D)It wouldn't change.
19
The __________ is the sum of all resistances in a series
A)calculated resistance
B)equivalent resistance
C)resistance total
D)resistance
20
A 45-Ω resistor and a 65-Ω resistor are connected in series. These resistors are then connected in parallel with a 120-Ω resistor. What is the equivalent resistance for the circuit?
A)150 Ω
B)22 Ω
C)57 Ω
D)230 Ω
21
What is the purpose of a voltage divider?
A)to produce a higher voltage from a lower-voltage battery
B)to produce a lower voltage from a higher-voltage battery
C)to produce exactly half the voltage of a higher-voltage battery
D)to produce exactly twice the voltage of a lower-voltage battery
22
Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?
A)The current drops to almost zero.
B)As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.
C)As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.
D)The voltage becomes too much for the circuit to handle.
23
What causes a fuse to blow?
A)too low a resistance
B)too high a voltage
C)too much resistance
D)too high a current
24
Voltmeters must have __________.
A)very low resistance
B)very high currents
C)very high resistance
D)very high voltage
25
Electrical wiring in homes uses __________ circuits.
A)overloaded
B)parallel
C)voltage
D)series
26
Why must an ammeter have an extremely low resistance?
A)High resistance changes the voltage reading.
B)High resistance ensures there are fewer ohms.
C)High resistance reduces risk of fire.
D)High resistance will change the current in the circuit you want to measure.
27
What happens when an electric switch is turned off?
A)There is a short circuit.
B)A circuit breaker turns off.
C)The circuit is broken.
D)The circuit becomes a series circuit.
28
A voltmeter should be connected to a circuit in __________.
A)short form
B)series
C)parallel
D)series-parallel
29
How does a ground-fault interrupter work?
A)It detects small differences in current caused by an extra current path and opens the circuit.
B)It detects small differences in temperatures and opens the circuit.
C)It detects small differences in voltage caused by an extra voltage path and opens the circuit.
D)It detects small differences in resistance and opens the circuit.
30
Current is measured by a(n) __________.
A)voltmeter
B)ohmmeter
C)ammeter
D)electrometer
31
How is a circuit breaker different from a fuse?
A)A circuit breaker does not detect current.
B)A circuit breaker is less sophisticated.
C)A circuit breaker causes fires.
D)A circuit breaker causes fires.
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