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**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)*I

_{rms}

5.4A=sqrt(2)*I

_{rms}

I

_{rms}=3.82A

I

_{rms}=P/V

_{rms}

3.82=1500/V

_{rms}

V

_{rms}=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.