Q19 of 238 Page 91

What is the principle of an electric motor? Name some of the devices in which electric motors are used.

The principle on which the electric motor work says that if a rectangular current carrying coil is placed in a magnetic field, a force act on it which make it to rotate continuously.

Some of the devices using electric motors are:- electric fans, washing machine, mixer, grinder, etc.


More from this chapter

All 238 →
17

Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.

 18

State Fleming's left-hand rule. Explain it with the help of labelled diagrams.

 20

In a d.c. motor, why must the current to the coil be reversed twice during each rotation ?

 20

What device reverses the current?