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What is power dissipation in an a.c. cir...

What is power dissipation in an a.c. circuit in which `E = 230 sin (omega t + pi//2) , I = 10 sin omega t`?

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As phase diff. `= 90^(@)`, therefore average power dissipated `P = E_(v) I_(v) cos 90^(@) =` Zero
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