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Exam 26: Ac Electricity

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Question 21

True/False

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Just as a 100 Ω resistor always has the same resistance no matter what circuit it is in,likewise a 50 μF capacitor always has the same reactance no matter what circuit it is in.

A) True
B) False

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Question 22

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The 60 Hz ac source of a series circuit has a voltage amplitude of 120 V.The capacitive and inductive reactances are 780 Ω and 210 Ω.respectively.The resistance is 460 Ω.In the figure,the rms current in the circuit is closest to:

A) 0.12 A
B) 0.13 A
C) 0.14 A
D) 0.16 A
E) 0.18 A

F) B) and C)
G) None of the above

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Question 23

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What is the resonance frequency of an LC circuit consisting of a 26.0 μF capacitor and a 0.010 H inductor?

The AC current through a capacitor lags the capacitor voltage by 90°.

A circuit containing a 39-H inductor has an alternating current supplied to it.If I_rms is 10.0 A and V_p is 18 V,find the frequency of the signal.

The 60 Hz ac source of a series circuit has a voltage amplitude of 120 V.The capacitive and inductive reactances are 980 Ω and 240 Ω,respectively.The resistance is 550 Ω.In the figure,the inductance,in mH,is closest to:

A series RLC circuit has a peak current of 1.0 A with a frequency of 66 kHz.If the resistance of the circuit is 51 kΩ the capacitance of the circuit is 13 μF,and the inductance of the circuit is 30 H,determine the average power of the circuit over one cycle.

A circuit with alternating current has its voltage and current in phase.How does the average power compare to the root mean square of the current and voltage?

The inductor in a radio receiver carries a current of amplitude 200 mA when a voltage of amplitude 2.4 V is across it at a frequency of 1400 Hz.What is the value of the inductance?

An RLC circuit has a reactance,due to its capacitance,of 11 kΩ;a reactance,due to its inductance,of 3 kΩ;and a resistance of 29 kΩ.What is the power factor of the circuit?

A step-up transformer lowers current but raises voltage.

The reactance of a capacitor is 7.0 kΩ at a frequency of 0.30 kHz.What is the capacitance?

To find the resonant frequency of an RLC circuit,you could adjust the frequency of the AC source until the current reaches its minimum value.

A capacitor,initially having a charge Q on the left plate and a charge -Q on the right plate,is connected to a switch and an inductor,as shown below.The frequency in which the current will flow back and forth after the switch is closed will increase if

A series AC circuit is shown.The inductor has a reactance of 60 Ω and an inductance of 170 mH.A 80 Ω resistor and a capacitor whose reactance is 110 Ω are also in the circuit.The rms current in the circuit is 1.6 A.In the figure,the voltage amplitude across the capacitor is closest to: