Rms Current And Voltage — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
RMS Current and Voltage Sinusoidal alternating current (AC) circuits only. Define instantaneous current as i(t) = I0 sin(wt) Square the instantaneous current: i 2(t) = I0 2 sin 2(wt) Integrate i 2(t) over a full cycle from 0 to T Divide by the period T to get the mean square value Take the square root to obtain the RMS value Waveform must be a pure sine or cosine wave Frequency must be constant over the period of calculation RMS value is the average value over a full cycle (which is actually zero) The 1/sqrt(2) factor applies to non-sinusoidal waves like square or triangular waves RMS current is same as the peak current