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ALTERNATING CURRENT AND VOLTAGE

Alternating Current and Voltage
Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is

5.93 V
16.54 V
1.65 V
10.60 V

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Alternating Current and Voltage
If a sine wave goes through 10 cycles in 20 s, the period is

2 s
20 s
4 s
100 s

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Alternating Current and Voltage
A square wave has a period of 60 s. The first odd harmonic is

500 kHz
33.33 kHz
50 kHz
5 kHz

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Alternating Current and Voltage
Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

Wave A leads wave B by 105°.
Wave A lags wave B by 105°.
Wave A lags wave B by 15°.
Wave A leads wave B by 15°.

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Alternating Current and Voltage
A phasor represents

the phase angle
the width of a quantity
the magnitude and a quantity direction
the magnitude of a quantity

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