Question 1

A 120-V rms signal at 60.0 Hz is applied across a series combination of a 30.0-mH inductor and a 100-Ω resistor. What is the rms value of the voltage across the inductor?

Accepted Answer

A)  0.700 V 
B)  119 V 
C)  100 V 
D)  13.5 V 
E)  120 V 
A)  0.700 V 
B)  119 V 
C)  100 V 
D)  13.5 V 
E)  120 V

Question 2

What inductance is needed in series with a 4.7-μF capacitor so the circuit will oscillate at a frequency of 10 kHz?

Accepted Answer

A)  21 μH 
B)  54 μH 
C)  4.7 mH 
D)  5.4 mH 
A)  21 μH 
B)  54 μH 
C)  4.7 mH 
D)  5.4 mH

Question 3

The peak current and voltage outputs of a generator are 20 A and 240 V, respectively. What average power is provided by the generator?

Accepted Answer

The answer of The peak current and voltage outputs of...

Question 4

A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-Ω resistor. What is the rms value of the current in this circuit?

Accepted Answer

A)  0.80 A 
B)  1.2 A 
C)  1.4 A 
D)  1.6 A 
E)  1.8 A 
A)  0.80 A 
B)  1.2 A 
C)  1.4 A 
D)  1.6 A 
E)  1.8 A

Question 5

The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?

Accepted Answer

A)  2 A 
B)  8 A 
C)  1/2 A 
D)  1/4 A 
E)  4 A 
A)  2 A 
B)  8 A 
C)  1/2 A 
D)  1/4 A 
E)  4 A

Question 6

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

Accepted Answer

A)  greater than the battery's terminal voltage. 
B)  equal to the battery's terminal voltage. 
C)  less than the battery's terminal voltage, but not zero. 
D)  zero. 
E)  equal to the voltage across the resistor. 
A)  greater than the battery's terminal voltage. 
B)  equal to the battery's terminal voltage. 
C)  less than the battery's terminal voltage, but not zero. 
D)  zero. 
E)  equal to the voltage across the resistor.

Question 7

A 120-V rms voltage at 1000 Hz is applied to an inductor, a 2.00-μF capacitor and a 100-Ω resistor. If the rms value of the current in this circuit is 0.680 A, what is the inductance of the inductor?

Accepted Answer

A)  34.2 mH 
B)  35.8 mH 
C)  11.4 mH 
D)  17.9 mH 
E)  22.8 mH 
A)  34.2 mH 
B)  35.8 mH 
C)  11.4 mH 
D)  17.9 mH 
E)  22.8 mH

Question 8

An ideal solenoid with 3000 turns is 70.0 cm long. If its self-inductance is 25.0 mH, what is its radius? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  0.0222 m 
B)  0.00199 m 
C)  327 m 
D)  52.0 m 
A)  0.0222 m 
B)  0.00199 m 
C)  327 m 
D)  52.0 m

Question 9

A series circuit consists of a 100-Ω resistor, a 10.0-μF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V rms, 60-Hz power supply. What is the rms current in the circuit?

Accepted Answer

A)  0.42 A 
B)  0.52 A 
C)  0.62 A 
D)  0.72 A 
A)  0.42 A 
B)  0.52 A 
C)  0.62 A 
D)  0.72 A

Question 10

You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-Ω resistor. How many windings should the secondary circuit contain?

Accepted Answer

The answer of You need an ideal transformer to reduce...

Question 11

A transformer is a device used to

Accepted Answer

A)  transform an alternating current into a direct current. 
B)  transform a direct current into an alternating current. 
C)  increase or decrease an ac voltage. 
D)  increase or decrease a dc voltage. 
A)  transform an alternating current into a direct current. 
B)  transform a direct current into an alternating current. 
C)  increase or decrease an ac voltage. 
D)  increase or decrease a dc voltage.

Question 12

The inductance of a solenoid that is 16.0 cm long and has a cross-sectional area of 1.00 × $10^{ - 4}$ $m ^ { 2 }$ is $1.00 \mathrm { mH }$ How many turns of wire does this solenoid have? (μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  318,000 
B)  159,000 
C)  1130 
D)  282 
E)  150 
A)  318,000 
B)  159,000 
C)  1130 
D)  282 
E)  150

Question 13

A coil with a self-inductance of 6.0 H has a constant current of 2.0 A flowing through it for 2.0 s. What is the emf induced in this coil?

Accepted Answer

A)  6.0 V 
B)  12 V 
C)  0.0 V 
D)  4.0 V 
E)  8.0 V 
A)  6.0 V 
B)  12 V 
C)  0.0 V 
D)  4.0 V 
E)  8.0 V

Question 14

What is the resonance frequency of a series ac circuit consisting of a 40.0 μF capacitor, a 55-Ω resistor, and a 0.030 H inductor?

Accepted Answer

A)  0.15 kHz 
B)  0.9 kHz 
C)  6.9 kHz 
D)  6 kHz 
A)  0.15 kHz 
B)  0.9 kHz 
C)  6.9 kHz 
D)  6 kHz

Question 15

An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,
(a) what voltage is present in the secondary?
(b) what current is present in the secondary?

Accepted Answer

(a) 240 V

Question 16

At what frequency does a 10-μF capacitor have a reactance of 1200 Ω?

Accepted Answer

A)  13 Hz 
B)  42 Hz 
C)  60 Hz 
D)  83 Hz 
A)  13 Hz 
B)  42 Hz 
C)  60 Hz 
D)  83 Hz

Question 17

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

Accepted Answer

A)  greater than the battery's terminal voltage. 
B)  equal to the battery's terminal voltage. 
C)  less than the battery's terminal voltage, but not zero. 
D)  zero. 
E)  equal to the voltage across the inductor. 
A)  greater than the battery's terminal voltage. 
B)  equal to the battery's terminal voltage. 
C)  less than the battery's terminal voltage, but not zero. 
D)  zero. 
E)  equal to the voltage across the inductor.

Question 18

An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?

Accepted Answer

The answer of An ideal step-down transformer is needed to...

Question 19

The current flowing through a circuit is changing at a rate of 6.0 A/s. If the circuit contains a 190-H inductor, what is the emf across the inductor?

Accepted Answer

A)  1100 V 
B)  11 mV 
C)  32 mV 
D)  32 V 
A)  1100 V 
B)  11 mV 
C)  32 mV 
D)  32 V

Question 20

What capacitance is needed in series with a 3.7-mH inductor so the circuit will oscillate at a frequency of 1000 Hz?

Accepted Answer

A)  0.15 mF 
B)  15 μF 
C)  6.8 μF 
D)  0.015 μF 
A)  0.15 mF 
B)  15 μF 
C)  6.8 μF 
D)  0.015 μF

Exam 26: AC Electricity

A 120-V rms signal at 60.0 Hz is applied across a series combination of a 30.0-mH inductor and a 100-Ω resistor. What is the rms value of the voltage across the inductor?

What inductance is needed in series with a 4.7-μF capacitor so the circuit will oscillate at a frequency of 10 kHz?

The peak current and voltage outputs of a generator are 20 A and 240 V, respectively. What average power is provided by the generator?

A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-Ω resistor. What is the rms value of the current in this circuit?

The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

A 120-V rms voltage at 1000 Hz is applied to an inductor, a 2.00-μF capacitor and a 100-Ω resistor. If the rms value of the current in this circuit is 0.680 A, what is the inductance of the inductor?

An ideal solenoid with 3000 turns is 70.0 cm long. If its self-inductance is 25.0 mH, what is its radius? (μ0 = 4π × 10-7 T ∙ m/A)

A series circuit consists of a 100-Ω resistor, a 10.0-μF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V rms, 60-Hz power supply. What is the rms current in the circuit?

You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-Ω resistor. How many windings should the secondary circuit contain?

A transformer is a device used to

The inductance of a solenoid that is 16.0 cm long and has a cross-sectional area of 1.00 × 10−410^{ - 4}10−4 m2m ^ { 2 }m2 is 1.00mH1.00 \mathrm { mH }1.00mH How many turns of wire does this solenoid have? (μ0 = 4π × 10-7 T ∙ m/A)

A coil with a self-inductance of 6.0 H has a constant current of 2.0 A flowing through it for 2.0 s. What is the emf induced in this coil?

What is the resonance frequency of a series ac circuit consisting of a 40.0 μF capacitor, a 55-Ω resistor, and a 0.030 H inductor?

An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, (a) what voltage is present in the secondary? (b) what current is present in the secondary?

At what frequency does a 10-μF capacitor have a reactance of 1200 Ω?

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?

The current flowing through a circuit is changing at a rate of 6.0 A/s. If the circuit contains a 190-H inductor, what is the emf across the inductor?

What capacitance is needed in series with a 3.7-mH inductor so the circuit will oscillate at a frequency of 1000 Hz?

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An ideal solenoid with 3000 turns is 70.0 cm long. If its self-inductance is 25.0 mH, what is its radius? (μ₀ = 4π × 10^-7 T ∙ m/A)

The inductance of a solenoid that is 16.0 cm long and has a cross-sectional area of 1.00 × $10^{ - 4}$ $m ^ { 2 }$ is $1.00 \mathrm { mH }$ How many turns of wire does this solenoid have? (μ₀ = 4π × 10^-7 T ∙ m/A)