Physics, asked by Anonymous, 11 months ago

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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Answered by nverma0811

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Answered by Anonymous

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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