Power In Ac Circuit Derivation Class 12. The opposition offered by an ac circuit containing more than one out of three components l c and r is called impedance z of the circuit. The ac power dissipated in a circuit can also be found from the impedance z of the circuit using the voltage v rms or the current i rms flowing through the circuit as shown.
P left v m times sin omega t right times left i m times sin left omega t phi right right note. Class 12 physics alternating current. A circuit element dissipates or produces power according to p iv where i is the current through the element and v is the voltage across it.
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Since the current and the voltage both depend on time in an ac circuit the instantaneous power p t i t v t is also time dependent. The power is defined as the rate at which work is being in the circuit. Cbse ncert notes class 12 physics alternating current. Ac power example no1 the voltage and current values of a 50hz sinusoidal supply are given as.
