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.
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