RC CIRCUITS QUIZ

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

3.46

4.24

21.63

2.16

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In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is

19.2 V

1.9 V

27 V

3 V

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The complex number 40 angle 55° is equivalent to

45.88 + j65.52

40 + j40

55 + j55

22.94 + j32.76

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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 decreased

is held constant

has no effect

must be increased

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A positive angle of 30° is equivalent to a negative angle of

–330°

–30°

–60°

–180°

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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?

73Ω

129Ω

167Ω

12.9Ω

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Point +4 on the complex plane is

4 units above the origin on the j axis

4 units left of the origin on the real axis

4 units right of the origin on the real axis

4 units below the origin on the j axis

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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

0.411 V

4.11 V

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In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

100 mA

282 mA

200 mA

141 mA

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What is the angular difference between +j4 and –j4?

180°

30°

90°

270°

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