Explain the working of DC 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.
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.
4) IF two half slip rings are connected to the ends of the coil as shown in figure, this generator works as DC generator to produce DC current.

Working:
1) When the coil is in vertical position the induced current generated during the first half rotation, rises from zero to maximum and then falls to zero again.
2) As the coil moves further from this position, the ends of the coil go to other slip rings.
3) Hence, during the second half rotation. the current is reversed in the coil itself. the current generated in the second half rotation of the coil is identical with that during the first half at the direct current (DC) from one revolution.

4) Hence , this current is called direct current (DC).