AC Circuits
RMS values, reactance, impedance, power factor and resonance. Medium difficulty, one answer each.
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For a sine wave with peak value Vm, the rms value is:
- Vm × √2
- Vm/π
- Vm/√2
- Vm/2
What is the peak value of a 230 V rms supply?
- 460 V
- 230 V
- About 163 V
- About 325 V
What is the peak-to-peak value of a 230 V rms supply?
- 460 V
- 325 V
- About 650 V
- 230 V
What is the period of a 50 Hz supply?
- 50 ms
- 2 ms
- 20 ms
- 0.5 s
What is the angular frequency of a 50 Hz supply?
- About 157 rad/s
- 100 rad/s
- 50 rad/s
- About 314 rad/s
In a purely resistive AC circuit, current and voltage are:
- In phase
- 180° apart
- 90° apart, current lagging
- 90° apart, current leading
In a purely inductive circuit, the current:
- Is in phase with the voltage
- Leads the voltage by 90°
- Is zero
- Lags the voltage by 90°
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