A question on alternating current

Kudo Shinichi

1. The problem statement, all variables and given/known data
The peak value of an alternating current in a 1500W device is 5.4A. What is the rms voltage (root-mean-square voltage)across it?

3. The attempt at a solution
Peak current=sqrt(2)*Irms
5.4A=sqrt(2)*Irms
Irms=3.82A
Irms=P/Vrms
3.82=1500/Vrms
Vrms=392.84V

I am not sure whether this is the correct way to do the question or not, because it seems to simple...Any comment/help would be great. Thank you very much.

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jdougherty

This is, in fact, the correct way to do it, easy though it may seem.

Kudo Shinichi

This is, in fact, the correct way to do it, easy though it may seem.
thank you very much^^

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