Question

An electric fan has an electric motor inside to change:
A) Mechanical energy into electrical energy
B) Thermal energy into electrical energy
C) Electrical energy into thermal energy
D) Electrical energy into mechanical energy

Answer 1

Hint: Fans mainly work using the electric motor. An electric motor operates mainly using the interaction between the electric and the magnetic field. An electric fan uses the electrical flow of charges from the electricity to produce or accelerate wind in the surrounding area.

Complete answer:
Electric fans are provided with the motor in it. Motors have the magnet to produce magnetic fields in it. Where the current passes through the armature windings provide the electric field. Due to the movement of electric and magnetic fields closest to each other, Torque is generated. This continuous torques makes the wings of the fan rotate. The wings speed ups the air which surrounds the ends of it and provide greater acceleration of air just below the fan. Hence the fan converts electrical energy from the electricity to the mechanical energy by the rotation of the wings to produce air.

Thus, the option D is correct.

Additional information: Fans always provided with three wings. This is because three wings in the fans are more stable when compared with two or multi blade fans. And three bladed fans provide more frictional force with the air. So, it has the ability to cool quickly the surrounding air than the others.

Note: Single phase induction motor is used in fans. In these electrical motors, the two magnets are placed. In between these, armature is placed. It is surrounded by the electrical wire windings. This motor converts the electrical energy into the mechanical energy.