With the aid of a diagram, describe how a simple a.c. generatorwork

How a.c generator works

• The coil is rotated in a magnetic field, the magnetic field linked with it changes and hence e.m.f is led away by means of slip rings which press slightly against the carbon brushes.
• Applying Fleming’s right hand rule, the induced current enters the coil AB and leave the coil via CD.
• Starting with the coil in the vertical position, the magnetic flux linking it is maximum and hence no induced e.m.f.
• The induced e.m.f increases with the position of the coil in the magnetic field until it becomes maximum with the coil in horizontal position and then decrease to zero as the coil rotates to the vertical position
• The force acting on the sides of the coil change as the coil passes over the position and hence he current flowing in the coil reverses. Hence an alternating e.m.f or current flows through the load.

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