>I measure the peak to peak value using my scope. Then power equals E
>squared divided by R. This is good enough for "government work".
This is wrong! Using peak voltage instead of RMS voltage of the peaks
will result in a power miscalculation by a factor of two. Using Peak to
Peak voltage instead of RMS voltage of the peaks would result in a
miscalculation by a factor of 8!
Peak voltage is 1.414 X RMS. Peak to peak voltage is 2 X Peak or 2 X
1.414 X RMS. When you square this in the power equation your
miscalculated power would be 8 X the actual power.
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