Question

define rms value of ac

Answer 1

Root mean square or R.M.S. value of Alternating voltage is defined as that valueof steady Potential Difference, which would generate the same amount of heat in a given resistance is given time, as is done by A.C. voltage , when maintained across the same resistance for the same time.


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Answer 2

It is the theoretical value of DC voltage which must be applied to the circuit to get same power consumption.
RMS value stands for Root Mean Square value.
Vrms=V0/√2