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List any 3 differences between AC & DC current

Asked by 15th February 2009, 12:28 PM
Answered by Expert

The electric current which changes its direction (or polarity) after certain fixed interval of time is called ac or alternating current. Thus , in ac, the polarity ( + or - ) is not fixed and its current V/S time graph is like a wave.

The electric current which flows in the same direction is called direct current or dc. Thus in dc the polarisation ( + or - ) are fixed The current obtained from a cell or battery is dc. The current V/S time graph is a straight line parallel to time axis.

Answered by Expert 15th February 2009, 8:07 PM
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