Question

When the coils of an electric generator rotate in a magnetic field,

• A. the mechanical energy changes into electric energy.
• B. the thermal energy changes into electric energy.
• C. the solar energy changes into electric energy.
• D. the wind energy changes into electric energy.

Answer 1

The correct option is A

the mechanical energy changes into electric energy.

The explanation for the correct option:

A: the mechanical energy changes into electric energy.

1. An electric generator is a device that converts mechanical energy into electric energy.
2. It works on the principle of electromagnetic induction.
3. Electromagnetic induction is a phenomenon in which a relative motion between magnet and conductor induces an electric current in the conductor.
4. In an electric generator, mechanical energy is a relative motion between magnet and conductor which gets converted into electrical energy that is induced by the electric current in the conductor.

The explanation for incorrect options:

1. A thermoelectric is a device used to convert thermal energy into electric energy.
2. A solar cell is a photoelectric cell that converts solar energy into electric energy.
3. A wind turbine is an electric device that converts wind energy into electric energy.

Thus, option A is correct.