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Physics XII Notes for Physics Notes

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Power In AC Circuit

Power in AC circuit is given by
P=IrmsErmscosθ
Here cosθ is power factor.

If θ=π/2 (purely inductive or resistive circuit)
P=0 (wattless current)
If θ=0 (purely resistive circuit)
P= IrmsxErms (wattful current)

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