Which of the following statements related to the working principles of a dynamo and an electric motor is correct?

Options :
  1. Dynamo converts electrical energy into heat energy and electric motor converts mechanical energy into electrical energy
  2. Dynamo converts mechanical energy into electrical energy and electric motor converts electrical energy into mechanical energy
  3. Both dynamo and electric motor convert electrical energy into mechanical energy
  4. Both dynamo and electric motor convert mechanical energy into electrical energy


Answer and Explanation :-

Answer: Option 2

Explanation:

A dynamo converts mechanical motion of a driven wheel into electrical motion, with the aid of a magnet. A dynamo has a number of magnets all with insulated wires. Their iron cores point towards the centre of a circle like the spokes of a wheel; and their curved inner faces form a circle in which a spool, wound with wire, is spun by the water wheel. An electric motor on the other hand converts electrical energy into mechanical energy. To do this, a motor needs a special kind of magnet known as an electromagnet. In its simplest form, this consists of an iron bar wrapped in a coil of wire. If someone passes an electric current through the wire, a magnetic field is formed in the iron bar, and it becomes a magnet, with definite north and south poles. If the current is turned off the magnetic properties will disappear.

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