A DC generator works on the principle of

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Ohm's law

Joule's law of heating

Faraday's laws of electromagnetic induction

None of the above

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UPSC NDA-2 – 2022

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A DC generator works on the principle of Faraday’s laws of electromagnetic induction.

Electromagnetic induction is the process where a conductor moving through a magnetic field (or a changing magnetic field near a conductor) induces an electromotive force (EMF), which can drive an electric current. Faraday’s laws quantify this phenomenon.

A generator utilizes mechanical energy (to rotate a coil or magnetic field) to cause a change in magnetic flux through a coil, thereby inducing an electric current according to Faraday’s laws. Ohm’s law relates voltage, current, and resistance in a circuit. Joule’s law of heating describes the heat produced by current flowing through a resistor. A motor works on the principle of the force experienced by a current-carrying conductor in a magnetic field.

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