115 Volts is the RMS (root mean squared) value of the sine wave.  The actual peak
value for a pure sine wave is the product of the square root of two times the RMS
value (i.e. 1.414 x 115V = 163V).  The correct voltage to use to calculate
resistive power is 115V.

Rick Bitto
 
 

Ron Westfall wrote:

>  
>
>   Keep in mind that AC power is a sine wave which has
> to be taken into consideration when calculating power consumption i.e 115V is
> the peak voltage, not the average voltage.

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