The AC generator works on the principle of electromagnetic induction to convert mechanical energy into electrical energy. It consists of a coil that rotates inside a stationary magnetic field. As the coil arms move up and down through the magnetic field, it causes induced currents that change direction periodically in the coil and external circuit, producing an alternating current. The Fleming's right hand rule determines the direction of the induced currents in the coil arms as they rotate.

1. A.C. GENERATOR

2. AC GENERATOR

3. WORKING PRINCIPLE
•The Electric Generator or AC Generator works
on the principle of EMI (Electromagnetic
Induction)
•AC generator Converts Mechanical Energy to
Electrical Energy.
•Fleming’s Right hand rule is used to find the
direction of the induced current.

5. CONSTRUCTION

7. WORKING
•Let us say the coil ABCD is rotated clockwise.
•So arm AB will go upwards and arm CD will go
downwards.
•By applying Fleming’s right-hand rule, the
induced currents are set up in these arms along
the directions AB and CD.
•Thus an induced current flows in the direction

10. WORKING
•After half a rotation, arm CD starts moving up
and AB moving down.
•As a result, the directions of the induced
currents in both the arms change, giving rise to
the net induced current in the direction DCBA.
• The current in the external circuit now flows
from B1 to B2 .

11. WORKING
•Thus after every half rotation the polarity of the
current in the respective arms changes. Such a
current, which changes direction after equal
intervals of time, is called an alternating
current (abbreviated as AC).
•This device is called an AC generator.

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