Previous Year Question
‘Dynamo’ is a device, which converts
chemical energy into electrical energy
electrical energy into mechanical energy
mechanical energy into electrical energy
electrical energy into chemical energy
Correct Answer: C
Detailed Solution
A Dynamo or Generator is a device that converts Mechanical Energy into Electrical Energy.
It works on the principle of Electromagnetic Induction. When there is relative motion between a conductor/coil and a magnetic field, causing the magnetic flux linked with the coil to change, an induced EMF is produced in the coil. If the circuit is closed, an induced current flows.
In a simple AC generator, the coil is mechanically rotated in a magnetic field. Due to this rotation, the magnetic flux linked with the coil changes continuously and electrical output is obtained.
Thus, the energy conversion is—
Mechanical Energy → Electrical Energy
It is useful to distinguish this from an Electric Motor. In a motor, the conversion is the reverse—
Electrical Energy → Mechanical Energy