Explain the working of AC electric generator with a neat diagram.

Explanation

1) Consider a rectangular coil . Let it be held between the poles of curve -shaped permanent magnet as shown in figure.
2) As the coil rotates the magnetic flux passing through the coil changes.
3) According to the law of electromagnetic induction an induced current is generated in the coil.

Working:
Consider initially the coil, positioned in such a way that magentic flux passes through it. When the coil is at rest in verticaly position. with side (A) of coil at top position and side (B) at bottom position no current will be induced in it. In this position , the current in the coil is zero.
2) When the coil is rotated in clockwise direction, current will be induced in it flows from A to B. During the first quarter of rotation, the current increases from zero to a maximum and reaches peak value when the coil is in horizontal position.
3) IF we continue the rotation of coil,current decreases during second quarter iof the rotation and once again becomes zero. When coil comes to vertical position with side B at top and side A at bottom. During second part of the rotation. Current generated follows the same pattern as that in the first half ,except that the direction of current is reversed.

Using induced current :
1) The ends of the coil are connected to two slips rings and two carbon brushes are arranged in such a way that they press the slip rings to obtain current from the coil.
2) When these brushes are connected to external device like T.V.etc. we can make them work with current supplied from ends of carbon brushes.
3) This current is called Alternating current (AC). in which the direction of charge flow reverses periodically.