Question

Guysss....explain the working of an electric generator.....plzzz help

Answer 1

An electric generator consists of a rectangular coil ABCD between the 2 poles of a permanent magnet such that the arm AB and CD are perpendicular to the magnetic field of the magnet. The 2 ends of the coil are connected to two slip rings R1 and R2 respectively. These rings are connected to two stationary brushes B1 and B2 respectively. The R1 and R2 are attached to the axle and the axle if mechanically rotated in order to rotate the coil inside the magnetic field. The ends of the two brushes are connected to a galvanometer in the external circuit to detect the flow of electric current. when the axle is rotated arm AB moves upwards and CD moves downwards and so the coil ABCD rotates in an anti-clockwise direction. on applying right-hand thumb rule it is observed that the induced current flows in the direction of ABCD and in the external circuit from B2 to B1. after half rotation arm CD moves upwards and AB moves downwards. and the direction of induced current is through DCBA and in the external coil it is from B1 to B2. Thus, every half rotation the direction of induced current in the respective arm changes.