A.C. Generator—Generator is a misnomer in physics, it generates nothing but it is a converter. Generator is an electrical device which is used to convert mechanical energy into electrical energy.
Principle—It works on the principle of electromagnetic induction. When a coili s rotated in a uniform magnetic field induced emf is produced.
Componenets—There are is components in a generator.
(i) Armature—It is a coil is which large number of turns are present. It is rectangular in shape. The wire is made up of insulated copper wrapped around soft iron core.
(ii) Field magnet—The main function of field magnet is to produce large magnetic field. Parmanent magnet or electromagnet may be used for this purpose but their strength must be very large. The rectangular coil is placed in between two magnet.
(iii) Slit Rings—R1 and R2 are two slip rings. It is attached with the armature cool. As coil rotated slip rings also rotates.
(iv) Carbon Brushes—B1 and B2 are two carbon brushes. It is compressed with the coil, as coil rotated it is not rotated. These brushes are connected to the load through which output can be obtained.
Theory—By defn of angular speed
w = θ/t .....(1)
θ = wt ....(2)
By defn of magnetic flux
Let us consider
Hence, alternating current is induced in the coil.
