The principle of generation of induced current in a coil by rotating it in a magnetic field is used in the making of which of the following electrical devices?

Options :
  1. Electromagnet
  2. Electric motor
  3. Electric generator
  4. Electric watt meter

Answer and Explanation :-

Answer: Option 3


In electricity generation, an electric generator is a device that converts mechanical energy to electrical energy. A generator forces electric current to flow through an external circuit. Electric generators are essentially coils of electric conductors, usually copper wire, that are tightly wound onto a metal core and are mounted to spin around inside an array of large magnets. Anytime an electric conductor moves through a magnetic field, the magnetism will interact with the electrons in the conductor to induce a flow of electrical current within it. The conductor coil and its core are called the armature. By connecting the armature to the shaft of a mechanical power source, such as an engine, the copper conductor can spin at very high speeds through the magnetic field, producing a powerful flow of electricity. The same principle applies whether the generator is driven by a bicycle wheel, a tractor engine or a steam turbine.

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