how we find R.M.S. value of current in A.C> source?

Question

DIFFERENCE BETWEEN R.M.S. VALUE & AVERAGE VALUE OF CURRENT

Answer 1

The average voltage is read by multimeters.
(Although there are true RMS meters as well)
To find the true RMS, multiply the reading by sqr(2).
This, of course, is only valid for sine currents.
For any other shape, use a scope!

Answer 2

Irms=0.707 Ipeak (in sine wave)
Irms=Ipeak (in pulse wave)

Average amplitude is the mathematical "mean" of all a waveform's points over the period of one cycle. Technically, the average amplitude of any waveform with equal-area portions above and below the "zero" line on a graph is zero. However, as a practical measure of amplitude, a waveform's average value is often calculated as the mathematical mean of all the points' absolute values (taking all the negative values and considering them as positive). For a sine wave, the average value so calculated is approximately 0.637 of its peak value.
"RMS" stands for Root Mean Square, and is a way of expressing an AC quantity of voltage or current in terms functionally equivalent to DC. For example, 10 volts AC RMS is the amount of voltage that would produce the same amount of heat dissipation across a resistor of given value as a 10 volt DC power supply. Also known as the "equivalent" or "DC equivalent" value of an AC voltage or current. For a sine wave, the RMS value is approximately 0.707 of its peak value.

Answer 3

RMS means root mean square .and average means average.the difference is clear in their names