General Physics

Cool goIITian

Joined:	18 Jun 2012
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8 Aug 2012 19:08:34 IST

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What is the advantages of AC over DC?

Blazing goIITian

Joined: 1 Apr 2007

Posts: 4025

12 Aug 2012 17:22:26 IST

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AC can be generated at high voltages, but DC cannot be generated at high voltages because sparking starts at the commutator at high voltage, due to which commutator gets damaged.
High voltages AC generators are much simpler and cheaper than DC generators of the same range. It is because in AC generators there i no commutator which is costly part and is damaged.
Alternating current can be stepped up or stepped down with a static device called transformer. When voltages is stepped up current decreases to a small value. Small current produces less heat and can be transmitted through a thin conductor.Thus it is possible to transmit AC at high voltages. This reduces the size of conductor, transmission losses ans increases transmission efficiency. At the receiving station, voltages can be stepped down to the required value by using step down transformer. This is most important reason for generating and using electrical energy as AC.
A.C. induction motors are simplest in construction, cheaper in cot and require less maintenance whereas D.C. motors are complicated.

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