NCERT Class 10 Science : Learning Concept
Science: Chapter 13-Magnetic Effects of Electric Current-Concepts
13.6 Electric Generator
Alternating Current Generator
In our daily lives, one important application of electromagnetic induction is the generation of electricity. The alternating current(a.c.) generator transforms mechanical energy into electrical energy.
Simple AC generator
Figure below shows a simple AC generator. It consists of a rectangular coil of wire ABCD(armature) which is mounted on an axle.
By turning the handle, the coil rotates between the poles of a permanent magnet. As the coil rotates between the poles of a permanent magnet. As the coil rotates, the rate at which it cuts the magnetic field changes with time. This induces an alternating e.m.f. between the coil which drives an alternating induced current in the external circuit where an electrical load, such as lamp is connected.