Unformatted text preview: 25. Now you average those values, obtaining 36 / 4 = 9. Finally, take the square root to get 3. The average is 2, but the rms average is 3. Doing this for a sine wave gets you an rms average that is the peak value of the sine wave divided by the square root of two. This is the same as multiplying by 0.707, so the relationship between rms values and peak values for voltage and current is: V rms = 0.707 V o and I rms = 0.707 I o In North America, the rms voltage is about 120 volts. If you need to know about the average power used, it is the rms values that go into the calculation....
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- Fall '10