- A. 3 V
- B. 27 V
- C. 19.2 V
- D. 1.9 V
RC Circuits
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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_____.
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A 470 Ω resistor and a 0.2 µF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is_____.
- A. 212 Ω
- B. 2.12 mS + j3.14 mS
- C. 3.14 mS + j2.12 mS
- D. 318.3 Ω
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A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?_____.
- A. 129 Ω
- B. 12.9 Ω
- C. 167 Ω
- D. 73 Ω
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In a series RC circuit, when the frequency and the resistance are halved, the impedance_____.
- A. Doubles
- B. Is halved
- C. Is reduced to one-fourth
- D. Cannot be determined without values
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A filter passes all frequencies.
- A. True
- B. False
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In an RC circuit, the impedance is determined by both the resistance and the capacitive reactance combined.
- A. True
- B. False
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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_____.
- A. 200 mA
- B. 100 mA
- C. 282 mA
- D. 141 mA
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The circuit phase angle is the angle between the total current and the applied (source) voltage.
- A. True
- B. False
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An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
- A. R = XC
- B. R > XC
- C. R < XC
- D. R = 5XC
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The capacitor voltage always leads the current by 90°.
- A. True
- B. False