^ac generator

Also called dynamos or electric oscillators or commutators is based on EMI. When a metallic – coil is rotated at a high speed in a strong magnetic field, due to the change in magnetic flux linked with the coil a voltage difference ε = ε₀ sin ωt, ε₀ = BANω is induced across the two ends of the coil connected to the rings R₁ & R₂ called Slip rings, which when fed to external load through carbon brushed B₁ & B₂ can supply current to load.