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Alternating Current and Voltage

Alternating Current and Voltage
A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle

is 30%
is 1%
is 100%
cannot be determined

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Alternating Current and Voltage
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

16 mA
45.12 mA
22.6 mA
39.6 mA

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Alternating Current and Voltage
A phasor represents

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

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Alternating Current and Voltage
If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is

54.4 V
8 V
5.44 V
7.07 V

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

100 s
20 s
2 s
4 s

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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

16.54 V
10.60 V
1.65 V
5.93 V

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