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AC stands for Alternating Current. It usually applies to voltages with >100 V RMS, but can also be used for other AC voltages, like 24 V industrial AC power.

8 votes

Why use RMS instead of the average voltage of half the cycle for power

We want 100 volts AC and 100 volts DC to heat a resistor to the same temperature. A worthy goal. The RMS formula gives us that "corrected" AC voltage. …
4redwings's user avatar
  • 191
0 votes

Average value and RMS value

The rms formula gives us the "corrected" AC voltage to do that given an AC waveform with a given Vpeak. … Let us now derive the Vrms formula so we will have an AC voltage to use in our DC-equivalent AC power calculations. …
4redwings's user avatar
  • 191