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RL Circuits

RL Circuits
Which of the following power factors results in less energy loss in an RL circuit?

0.8
0.2
1
0.4

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

decreased
increased
not a factor
doubled

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RL Circuits
A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 angle 0° mA. The source voltage, expressed in polar form, is

13.84 angle 69.4° V
0.3 angle 20.6° V
12.8 angle 20.6° V
3.84 angle 20.6° V

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RL Circuits
When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle

decreases
is not affected
increases
cannot be determined

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RL Circuits
A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

942Ω
1200Ω
152.6Ω
1526Ω

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RL Circuits
In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is

4.24 A
6 A
42.4 A
424 mA

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