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In an a.c. circuit the e.m.f. (ε) and the current (l) at any instant are given respectively by ε = E0 sinωt, i - l0 sin (ωt- ϕ)

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In an a.c. circuit the e.m.f. (ε) and the current (l) at any instant are given respectively by

ε = E0 sinωt, i - l0  sin (ωt- ϕ)

The average power in the circuit over one cycle of a.c. is

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