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Alternating Current and Voltage

Alternating Current and Voltage
A phasor represents

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

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

4 s
20 s
100 s
2 s

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

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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

1.65 V
10.60 V
5.93 V
16.54 V

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Alternating Current and Voltage
If the rms voltage drop across a 15 k resistor is 16 V, the peak current through the resistor is

10 mA
1 mA
1.5 mA
15 mA

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Alternating Current and Voltage
One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

None of these
0°
45°
40°

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