Question

Why does direction of current change in generator ac?

Answer 1

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HERE IS YOUR ANSWER ➡️
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Now the currents in the wires reverse direction. This is how AC is generated. ... as the magnet rotates the South pole passes the same coil of wire. Because it is the opposite magnetic polarity the magnetic flux induces a voltage in the opposite direction in that coil of wire.

Answer 2

When a wire is moved in the magnetic field of a generator, the movement, magnetic field and current are all at right angles to each other. If the wire is moved in the opposite direction, the induced current also moves in the opposite direction.

Remember that one side of a coil in a generator moves up during one half turn, and then down during the next half turn this is the reason..