Posted by nv on January 16, 2010 at 18:41:41 from (173.28.98.245):
In Reply to: AC electric posted by teddy52food on January 16, 2010 at 18:09:18:
True, it goes positive 6o times per second and negative 60 times per second, but it is zero for a total of 120 times a second.
The 120 volts you are used to referencing is RMS value which is Root Mean Square which is the square root of the squares of all the instantaneous values of the sine wave.
True peak value of any sine wave is 1.414 times the RMS value.
So, the typical house voltage of 120 volts is the amount of AC voltage that would produce the same amount of heat in a purely resistive circuit if it were being powered by a 120 volt battery.
The actual peak to peak voltage of the household power is nowhere close to 120 volts if you would look at it with an oscilloscope.
Rather, it is 1.414 times the 120 volts it is typically called.
Likewise, RMS value is .707 times the Peak to Peak voltage.
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