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Wattless Current

The average power dissipated during a complete cycle is EvIv. cos Φ

The current in A.C. circuit is said to be wattles when the average power consumed in the circuit is zero.
If an ac circuit in the circuit is zero.

If an ac circuit is purely inductive or purely capacitive with no ohmic resistance, phase angle Φ = π/2 so that cos Φ = 0 or the power consumed is rightly called the wattles or idle current. In this situation, the circuit does not consume any power, though it offers a resistance to the flow of alternating current in it. It is the principle of choke coil.

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