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Question

A generator or dynamo works on the principle:

A
Heating effect of electric current
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B
Electromagnetic induction
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C
Chemical effect of electric current
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D
All of the above
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Solution

The correct option is A Electromagnetic induction
Magnetic effect of electric current:
Due to this effect, magnetic field is induced near a current carrying wire. Electromagnets are designed on this principle.
Electromagnetic Induction:
Due to this effect, an emf 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.
Heating effect of electric current:
Due to this effect, resistor heats up when electric current passes through it. This phenomenon is used in electrical fuses.

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