Physics
Answer
An A.C. generator is a device which converts the mechanical energy into the electrical energy using the principle of electromagnetic induction.
Principle — In a generator, a coil is rotated in a magnetic field. Due to rotation, the magnetic flux linked with the coil changes and therefore an e.m.f. is induced between the ends of the coil. Thus, a generator acts as a source of current in an external circuit containing load when connected between the ends of it's coil.
Use — We use a.c. generator in our house as an alternative source of electricity when electric supply from mains is not available.
Related Questions
Why does it become more difficult to move a magnet towards a coil when the number of turns in the coil has been increased?
Explain why an induced current must flow in such a direction so as to oppose the change producing it.
In an a.c generator the speed at which the coil rotates is doubled. How would this affect (a) the frequency of output voltage (b) the maximum output voltage.
State two ways to produce a higher e.m.f. in an a.c generator.