Alternating currents Quiz
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5 questions, one answer each
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1. A sinusoidal supply has peak voltage 20 V. What is the rms voltage?
- A. 14 V
- B. 28 V
- C. 10 V
- D. 20 V
2. A sinusoidal current has I_rms = 3.0 A. What is the peak-to-peak current?
- A. 4.2 A
- B. 6.0 A
- C. 3.0 A
- D. 8.5 A
3. An oscilloscope trace has one cycle across 5.0 divisions with a time-base of 2.0 ms per division. What is the frequency?
- A. 10 Hz
- B. 100 Hz
- C. 500 Hz
- D. 5.0 Hz
4. A 10 Ω resistor carries an alternating current of peak value 2.0 A. What is the mean power?
- A. 40 W
- B. 10 W
- C. 20 W
- D. 80 W
5. Which statement about the mean power is correct for a sinusoidal ac supply?
- A. It is zero
- B. It is half the peak power
- C. It equals the peak power
- D. It is twice the peak power