Question

A generator or dynamo works on the principle:
(A). Heating effect of electric current
(B). Electromagnetic induction
(C). Chemical effect of electric current
(D). All of the above

Answer 1

- Hint: From flipping a switch to heating a snack in the microwave, electricity is everywhere. Now that you thought about it, you might wonder how this essential energy source is generated and how it arrives at your doorsteps. Electricity is produced in power stations using turbines and generators. A turbine converts available energy into rotation while generators convert rotation into electricity. Hence, a generator is a machine that converts available mechanical energy into electrical energy.

Complete step-by-step solution -
Heating effect of electric current:
Due to this effect, the resistor heats up when electric current passes through it. This phenomenon is used in electrical fuses.
Electromagnetic Induction:
Due to this effect, an electromotive force is induced in a coil when magnetic field lines passing through the coil changes. This is the principle used in a generator or a dynamo.
Chemical effects of electric current:
Due to this effect, chemical composition of compounds through which the electric current passes changes. Electrolysis is based on this phenomenon.
Hence option B is correct.

Note: Generator works on the principle of Faraday’s Law of . Based on the output obtained, we classify generators as: AC Generators and DC Generators. An AC generator, also known as alternators, is a machine that converts mechanical energy into electrical energy. A DC generator is an electrical machine whose main function is to convert mechanical energy into electricity.