Alternating Current
Mains supply reverses direction fifty times a second, yet bulbs glow steadily. Chapter 7, Alternating Current, of the NCERT Physics textbook for Class 12 explains the steady glow behind the reversal. You will study rms values, phasor diagrams, and circuits with resistors, inductors and capacitors alone and in series. Resonance with its sharp current peak, power with power factor and wattless current, and the transformer with its role in long distance transmission show alternating current running the modern grid.
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