class 12 phy
1. show that the average power consumed in a circuit in an inductor L connected to an ac source is zero.
2. in a series LR circuit,XL=R and the power factor of the circuit is P1.when a capacitor with capacitance C such that XC= XL is put in series , the power factor becomes P2. find out P1/P2
also tell me how's this pic
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v = Vmsinwt
i = imsin(wt-pi/2)
p= vi
= Vmsinwt×imSIn(wt-pi/2)
=Vm im (sinwt) × (-coswt)
= Vm im sinwt coswt × 2/2
= Vm/√2 im/√2 2 sinwt coswt
= -Vrms irms sin2wt
the average power over one cycle
(P) = -Vrms irms (sin2wt)
(sin2wt) = 0
(p) = 0
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