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Q:
vrms=0.707 vp. from where we get the value 0.707???
- john (age 23)
canada
A:
For a nice sinusoidal wave, say V
psin(ωt), the maximum voltage is V
p. The average square of sin(ωt) is just 1/2. (sin
2 +cos
2=1, and each has the same average.) So the average of the voltage squared is just V
p/sqrt(2). 1/sqrt(2) =0.707.
This only works for sine waves, not say triangle or square waves.
Mike W.
(published on 07/29/2009)
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