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RL Circuits

RL Circuits
If a load is purely inductive and the reactive power is 12 VAR, the apparent power is

24 VA
12 VA
6 VA
0 VA

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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

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

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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
42.4 A
6 A
424 mA

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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
3.84 angle 20.6° V
12.8 angle 20.6° V

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

halves
doubles
cannot be determined without values
remains constant

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

cannot be determined
decreases
increases
is not affected

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