Question

write difference between AC and DC current why do we prefer AC to transmission to long distance while most of the appliances are based on DC​

Answer 1

In ac - current changes periodically

In dc - the current always goes directly

The short answer is that AC is easier to transmit over distance. ... Because AC allows changing the voltage (through transformers), and the higher the voltage, the easier it is to transmit electrical POWER long distances (i.e.: it minimizes the loss of power due to the inherent electrical resistance of power lines.)