Question
Describe an AC generator
Answer
An AC generator, also known as an alternator, is a device that converts mechanical energy into electrical energy in the form of an alternating current (AC). It works on the principle of electromagnetic induction, where a changing magnetic field induces an electric current in a conductor.
It consists of four main parts:
- Armature: Armature consists of a large number of insulated copper wire wound over a soft iron core.
- Field magnet: A strong permanent or electromagnet with a cylindrical pole acts as a field magnet which generates a uniform magnetic field perpendicular to the axis of rotation of the coil in between which the armature coil rotates.
- Slip ring: The ends of the armature coil are connected to brass slip rings, which rotate along with the armature.
- Brushes: Two carbon brushes are pressed against the slip rings, which carry the current produced from the generator to the external circuit.
