Dynamo
Arus elektrik yang dihasilkan oleh dinamo ialah arus ulang alik (AU/AC); Tenaga elektrik yang dihasilkan oleh dinamo ialah hasil daripada aruhan kemagnetan. A dynamo is an electrical generator that creates direct current using a commutator. Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current alternator, and the rotary converter.
Reference : Wikipedia