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RC Circuits

RC Circuits
The complex number 40 angle 55° is equivalent to

22.94 + j32.76
45.88 + j65.52
40 + j40
55 + j55

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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
has no effect
must be decreased
is held constant

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

19.52 W
275 W
195.2 W
25 W

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RC Circuits
When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

increases
remains the same
decreases
doubles

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RC Circuits
A 2 kΩ resistor and a 0.002 μF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

845 mW
84.5 mW
13 mW
130 mW

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RC Circuits
A 12 kΩ resistor is in series with a 0.02 μF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 angle 0° mA, what is the source voltage expressed in polar form?

411.3 V
45.6 V
4.11 V
0.411 V

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