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well it depends whether u r talking about ac source or dc source i'll derive both the expressions:
when with dc:
E=Ldi/dt
Edq=Ldi/dt*dq
dW=Lidi
Integerating both sides
W=1/2Li^2
this expression per unit time gives the power
For Ac source:
P=EI*cos&
&=Phase Angle
&=90 for purely inductive circuit
so,
P=0 for AC source
Hope this helps u!

2007-02-01 19:11:10 · answer #1 · answered by Anonymous · 0 0

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