# College Physics Reasoning and Relationships

Physics & Astronomy

## Quiz 22 :

Alternating-Current Circuits and Machines

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The output voltage of an AC generator is of the form A typical frequency in household circuits is 60 Hz. Using radians for angular measure in this equation, what is the factor in radians per second for this frequency?

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C

If the rotating coil used in a generator has its radius doubled, what change results in the amplitude of the voltage produced?

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B

In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this frequency?

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B

What is the effective (rms) current value for an AC current with an amplitude of 20 A?

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In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?

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The rate of heat dissipation in an AC circuit with resistance, R, and effective current, I

_{rms}, is given by which of the following? Multiple Choice

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An AC voltage source, with a peak output of 200 V, is connected to a 25- resistor. What is the effective (or rms) current in the circuit?

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An AC voltage source, with a peak output of 200 V, is connected to a 25- resistor. What is the rate of energy dissipated due to heat in the resistor?

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An AC voltage source, with a peak output of 120 V, results in dissipation of energy in a resistor at rate of 50.0 W. What is the value of the resistance?

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The frequency in an AC series circuit is halved. By what factor does this change the capacitive reactance?

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In an AC series circuit the capacitive reactance is 253 and frequency is 100 Hz. What is the capacitance?

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A 17.0-F capacitor is connected to an AC source with an rms voltage of 120 V and a frequency of 60.0 Hz. What is the rms current in the capacitor?

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When a 50-F capacitor is attached to an AC source, its capacitive reactance is 60 . If instead a 200-F capacitor is attached to the same source, what will be its capacitive reactance?

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A 400-resistor and a capacitor are connected in parallel across a 300-Hz source. If the amplitude of the current in the resistor is equal to that in the capacitor, what is the value of the capacitance?

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In the inductor of a 60-Hz AC series circuit, the peak voltage precedes the peak current in each cycle by what time interval?

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In an AC series circuit, the voltage in the inductor differs in phase with the voltage in the capacitor by what angle?

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