Notes of Chapter 16: Alternating Current of “Physics XII” for FSc Part 2 published by Punjab Textbook Board, Lahore. These notes are very helpful to prepare Physics paper of FSc Part 2 for Federal Board, Multan Board, Faisalabad Board, Sargodha Board, Gujranwala Board, DG Khan Board, Rawalpindi Board or any other board of Punjab, Pakistan.

The current that is produced by a voltage source whose polarity keeps on reversing with time is called alternating current.The value of the voltage or current that exist in a circuit at any instant of time t measured from some reference point is known as its instantaneous value.