Question

An electric motor converts mechanical energy into electric energy.
A. True
B. False

Answer 1

Hint:Mechanical energy in the electric motor is possessed by the rectangular coil. The electrical energy is supplied to the electric motors. Recall the principle of induced magnetic field to answer this question.

Complete answer:
We know that the mechanical energy is the energy possessed by the body when it is moving. In an electric motor, we can say mechanical energy is the energy possessed by the rotor or rectangular coil of the motor when it is rotating. Also, we are familiar with electric energy. It is the energy stored due to flow of electric current.

We know that when we connect the motor to the supply, its rotor starts rotating. Therefore, we can conclude that the electric energy supplied to the electric motor is converted into the useful mechanical energy. Therefore, the given statement is false.

So, the correct answer is option (B).

Additional information:
To understand how electric energy supplied to the electric motor is converted into the mechanical energy, we should understand the principle of its working. In the electric motor, the rectangular coil (DC motor) or rotor (AC motor) is placed between the strong magnets. When the electric current passes through the rectangular coil, we know that the magnetic field generates along with it around the rectangular coil. This induced magnetic field is opposed by the strong magnets and the rectangular coil experiences torque. Therefore, the rectangular coil starts rotating.

Note: Generator is the device which converts mechanical energy into electrical energy. Mechanical energy in the generator is produced by ignition of fuel. Thus, electric motors and generators have opposite working principles.