Advantages of AC over DC:
- The generation of AC is cheaper than that of DC.
- AC machines are simple, robust and do not require much attention for their repairs and maintenance during their use.
- Wide range of voltage are obtained by the use of transformer.
- The magnitude of current can be reduced by using an inductance or a conductor without any appreciable loss of energy.
- AC can easily be converted in DC with the help of rectifier.
- When AC is supplied at high voltage in distance transmission, the line loss are small compared to DC transmission.
Disadvantages of AC over DC:
- Peak value of AC is high and it is dangerous to use so better insulation is required.
- AC cause more interference with the near by communication line.
- An AC is transmitted from surface of the conductor and hence need several strands of thin wire insulated from each other.
- In AC transmission, voltage regulation is poor than of DC transmission.
- In AC line cannot rapid changes in magnitude and direction of power flow as DC line.
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