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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 voltage applied to a series RC circuit is increased, the phase angle

decreases
remains the same
increases
becomes erratic

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RC Circuits
A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?

707 and θ = –19.5°
73.4 and θ = –19.5°
734 and θ = –38.9°
2121 and θ = –19.5°

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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 = 5XC
R < XC

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

second quadrant
first quadrant
fourth quadrant
third quadrant

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RC Circuits
In a series RC circuit, when the frequency and the resistance are halved, the impedance

is reduced to one-fourth
cannot be determined without values
is halved
doubles

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