DC Motor
DC Motor
An electric motor is a rotating device used for converting electric energy into mechanical energy.
Principle:
An electric motor is based on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, two equal and opposite forces act on the coil which rotates it continuously.This force which rotates the coil is called as torque.
Construction:
It consists of a rectangular coil, say ABCD connected to a source of current and a switch. The commutators P and Q are fixed to the coil and pressed tightly against brushes X and Y. The function of commutator is to reverse the direction of current flowing through the coil every time, the coil passes the vertical position, i.e. after every half rotation in electric motor. In electric motor, split rings acts as commutator. The brushes are two flexible metal plates or the carbon rods which are so fixed that they continuously touches the revolving rings.
Working:
A commutator changes the direction of current in the coil of | |||
| Right Option : A | |||
| View Explanation |
An electric motor | |||
| Right Option : D | |||
| View Explanation |
Which of the following devices has a motor? | |||
| Right Option : D | |||
| View Explanation |
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