A question on alternating current

[Kudo Shinichi]

Homework Statement

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?

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.

 

[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^^