15. Power companies supply ac, not dc, because:

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16. If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the

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17. The phase difference between sine waves of different frequencies is:

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18. If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?

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19. What term expresses the frequency of a rectangular wave?

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20. AC effective voltage is named:

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21. If a voltmeter measures a sine wave as 500 mV, what would be its average value?

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