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RC Circuits

RC Circuits
For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is

275 W
195.2 W
25 W
19.52 W

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RC Circuits
A 47Ω resistor and a capacitor with a capacitive reactance of 120 are in series across an ac source. What is the circuit impedance, Z?

129Ω
73Ω
167Ω
12.9Ω

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RC Circuits
A capacitor with 150Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is

Z = 150 angle – 90° Ω
Z = 150 angle 180° Ω
Z = 150
Z = 150 –90° Ω

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RC Circuits
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

increases
decreases
does not change
decreases to zero

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RC Circuits
The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency

must be increased
is held constant
has no effect
must be decreased

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RC Circuits
A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is

9.2 mA
92 mA
460 mA
4.6 mA

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