Advantages of alternating current /advantages of AC over DC
AC power can be transmitted over long distances using a step-up transformer, but DC power cannot be transmitted this way.
Generating and transmitting AC power as dc power is cheap and easy. The efficiency of an alternator is higher than a DC generator. Power loss when transmitting ac power is very small.
AC size can be reduced without losing much energy. DC motors require brushes to make electrical contact with the moving coil of wire, while ac motors do not.
AC power causes less interference to nearby communication cables, such as telephone lines. Suitable for domestic and industrial applications.
AC power also increases the efficiency of AC machines, so the iron and copper losses in DC machines and transformers are smaller.