Power dissipation is maximum in (a) Pure capacitive circuit (b) Pure inductive circuit (c) Pure resistive circuit (d) None of these

Power dissipation is maximum at option (c) Pure resistive circuit


In an AC circuit, the power dissipated in the circuit is given as follows

The ϕ is the phase difference between the current and the voltage.

In the purely resistive and capacitive circuits, the phase difference is 90, so the power dissipated tends o zero.

But in a purely resistive circuit, the voltage and current are in the same phase so the phase difference is zero. Hence, it will have maximum power dissipation as cosϕ=1 in this case.

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