RMS Values

The Root Mean Square (R.M.S) value of a voltage or current is:

V_RMS = V_P / Ö2 and I_RMS = I_P / Ö2

where V_RMS and I_RMS are the R.M.S. values, and V_P and I_P are the peak values.

Ö2 » 1.414

Similarly, multiply R.M.S. by Ö2 to get the peak value.

Values quoted are R.M.S. unless otherwise stated - normally the R.M.S. subscript is left off.

E.g. 240V A.C. mains has a peak value of 240 X Ö2 = 340V peak.