Many electrical equipment requires large current at low or medium voltage. For example , electric lights and motors require high voltage and current, that cannot be supplied by the battery as a result. We require source of power other than batteries. These large sources of poaer are supplied by rotating electrical machines called D.C. generators.
After going through this unit you will be able to
- explain the method of electricity generation from magnetism, Principle or operation of generator
- describe the self excited generator
- explain the construction and working of d.c.motor
- classify the d.c. motors
- explain the necessity of starter