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RC Circuits

RC Circuits
What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

4.24
2.16
3.46
21.63

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

increases
does not change
decreases to zero
decreases

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RC Circuits
A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is

18 kHz
12 kHz
0 Hz
6 kHz

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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
3.7Ω
14400Ω
4800Ω

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

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RC Circuits
In the complex plane, the number 4 + j3 is located in the

third quadrant
first quadrant
second quadrant
fourth quadrant

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