Question

Hello guys!


Prove that the energy dissipation in the inductor and capacitor is zero while in resistor is not zero also explain the reason why it is so !


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Answer 1

Answer:

"Active" Power is zero in circuit in which current and voltage are 90 degrees out of phase, you can see it in the formula:

S=P+jQ

in that case S is the complex power, P is the active power which is the average power, and Q is the reactive power, that means, the power consumed by the reactive elements. In each case:

P=V*I*cosφ

Q=V*I*senφ

where φ is equal to the phase difference between current and voltage, so, as you can see when φ=90 the Active power or average power equals zero

Answer 2

Answer:

"Active" Power is zero in circuit in which current and voltage are 90 degrees out of phase, you can see it in the formula:

S=P+jQ

in that case S is the complex power, P is the active power which is the average power, and Q is the reactive power, that means, the power consumed by the reactive elements. In each case:

P=V*I*cosφ

Q=V*I*senφ

where φ is equal to the phase difference between current and voltage, so, as you can see when φ=90 the Active power or average power equals zero