A sinusoidal alternating current of peak...

A sinusoidal alternating current of peak value `(I_0)` passes through a heater of resistance R. What is the mean power output of the heater?

`(l_(0)^(2)R)/(2)`

`(l_(0)^(2)R)/(sqrt(2))`

`2l_(0)^(2)R`

`sqrt(2)l_(0)^(2)R`

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