Alternating current is normally produced by a

Alternating Current (AC) is the electric current in which the magnitude and direction vary cyclically.

In other words:

It is a variable electric current in which electrical charges change the direction of movement periodically.

Unlike Direct Current (DC), that is produced by a chemical reaction (a battery, for example), alternating current is produced by a generator that converts mechanical energy into electrical energy.

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answeralert drivers who drift off the road;