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RC Circuits

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

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

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RC Circuits
In the complex plane, the number 14 – j5 is located in the

fourth quadrant
third quadrant
first quadrant
second quadrant

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RC Circuits
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

R < XC
R = XC
R > XC
R = 5XC

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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
25 W
195.2 W
275 W

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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

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

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RC Circuits
A 120Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?

37.9Ω
4800Ω
3.7Ω
14400Ω

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