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In an a.c. circuit, why is there no power consumption for an ideal inductor?

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In an a.c. circuit, why is there no power consumption for an ideal inductor?

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The power in an a.c. circuit is wattless as phase difference of 90° exists between current and voltage.

Power = Iv. Ev cos Φ

Since current and voltage have a difference of 90°,

∴ Power = Iv. Ev cos 90° = 0.

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