Why AC systems are more used or preferred over DC systems?

The reasons why AC systems are more widely used and more preferable than DC systems are as follows:

1. It is comparably easy to maintain and modify the voltage of AC electricity for transmission and distribution than it is for DC electricity.
2. The entire plant cost, ie, circuit breakers, isolators, transformers, etc is much lower in comparison to that of DC transmission.
3. All the power stations produce AC electricity, and hence it is advantageous and also easy to use AC rather than converting it and using DC.
4. AC is practically a sine wave current, and hence in case of a large fault in the network, the sine wave will naturally tend to zero at some point and hence it is very easy to interrupt it in an AC system rather than in a DC system.