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RL CIRCUITS

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
1526Ω
1200Ω
152.6Ω

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

remains constant
is not a factor
increases
decreases

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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

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

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RL Circuits
Referring to Problem 23, the reactive power is

100 mVAR
10 mVAR
148 mVAR
6.76 mVAR

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

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