RC CIRCUITS QUIZ

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

first quadrant

second quadrant

third quadrant

fourth quadrant

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

is reduced to one-fourth

doubles

cannot be determined without values

is halved

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A capacitor with 150Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is

Z = 150

Z = 150 angle 180° Ω

Z = 150 angle – 90° Ω

Z = 150 –90° Ω

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Point +4 on the complex plane is

4 units below the origin on the j axis

4 units right of the origin on the real axis

4 units above the origin on the j axis

4 units left of the origin on the real axis

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

180°

30°

270°

90°

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

increases

does not change

decreases

decreases to zero

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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°

2121 and θ = –19.5°

73.4 and θ = –19.5°

734 and θ = –38.9°

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A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is

9.2 mA

4.6 mA

92 mA

460 mA

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

first quadrant

fourth quadrant

second quadrant

third quadrant

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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

130 mW

845 mW

13 mW

84.5 mW

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