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RL Circuits

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

1
0.8
0.2
0.4

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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

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

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RL Circuits
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

2 V
20 V
26.0 V
18.4 V

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RL Circuits
When the frequency is decreased, the impedance of a parallel RL circuit

increases
decreases
is not a factor
remains constant

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

cannot be determined without values
should be constant
should be decreased
should be increased

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RL Circuits
A 47Ω resistor is in series with an inductive reactance of 120Ω across an ac source. The impedance, expressed in polar form, is

129 angle 31.4°
120 angle 68.6°
129 angle 68.6°
47 angle 68.6°

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