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In an A.C. circuit with voltage V and current I the power dissipated is:

1. dependent on the phase between V and I
2. 1/√2 VI
3. 1 VI
4. 1/√1 VI

Correct answer: dependent on the phase between V and I

Solution

The power dissipated in an AC circuit depends on the phase difference between voltage (V) and current (I). The actual power is given by P = VIcos(ϕ), where ϕ is the phase angle between V and I.

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