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# Electrical Engineering - RL Circuits

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### Exercise

"When ambition ends, happiness begins."
- (Proverb)
1.

A 1.5 k resistor and a coil with a 2.2 k inductive reactance are in series across an 18 V ac source. The power factor is

 A. 564 B. 0.564 C. 6.76 D. 55.7

2.

The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is

 A. increased B. decreased C. doubled D. not a factor

3.

In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is

 A. 18.4 V B. 26.0 V C. 2 V D. 20 V

4.

Referring to Problem 18, the circuit impedance is

 A. 458 –76° B. 4.58 –76° C. 45876° D. 4.5876°

5.

To increase the current in a series RL circuit, the frequency

 A. should be increased B. should be decreased C. should be constant D. cannot be determined without values