What is the PEP produced by 200 volts peak-to-peak across a 50-ohm dummy load?

Explanation

For a sine wave into a resistive load, PEP equals the RMS power: 200 V peak-to-peak is 100 V peak, which is 70.7 V RMS, and 70.7² / 50 = 100 watts. Using the peak-to-peak value directly in the power formula is what yields the 400-watt distractor.