What is the significance of rms voltage




















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But, 5 volts of AC is not 5. The average value is zero everytime. It's indeed RMS value. I understand it now. You're talking about the average value of half cycle not complete. Considering a complete cycle, it'd be definitely zero.

In case of half cycle, the expression is the same as you said. By taking the square root, you get back to an unsquared value that averages the magnitudes, regardless of sign. Show 1 more comment. This is what makes the rms value "a good idea".

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