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RL Circuits

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

0.564
55.7
564
6.76

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

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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

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

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RL Circuits
Referring to Problem 23, the reactive power is

100 mVAR
148 mVAR
6.76 mVAR
10 mVAR

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RL Circuits
A 470Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is

12.60 angle –76° mS
12.18 angle –76° mS
12.18 angle 76° mS
218 angle –76° mS

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RL Circuits
If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit

halves
cannot be determined without values
remains constant
doubles

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