Two types of current

1. alternating current (ac current).

2. direct current (dc current).

1. alternating current (ac current):- a current which changes its magnitude and direction many time in a second is called alternating current.

Aircraft frequency is 400 hertz and 115 volt.

2.direct current (dc current):- a current is not change its magnitude that it is in steady condition is called direct current.

Example of direct current is battery we use direct current from battery.