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In an ac circuit the emf (e) and the current (i) at any instant core given respectively by `e = E_O sinomegat`, `I= I_o sin (ωt- φ)` The average power in the circuit over one cycle of ac

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In an ac circuit the emf (e) and the current (i) at any instant core given respectively by `e = E_O sinomegat`, `I= I_o sin (ωt- φ)` The average power in the circuit over one cycle of ac is.
Options:
(a) `(E_oI_o)/2 cosvarphi` (b) ` E_0 I_0` (c) `(E_0I_0)/2` (d) `(E_oI_o)/2 sinvarphi`

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