Abstract: a resistance adjustable power generator having: an operating unit that receives commands of a user and is able to switch the resistance adjustable power generator to either a release mode or a resistance mode; a resistance generating unit that receive the commands from the operating unit and provides adjustable multiple levels of resistance to a connecting device, with the resistance generating unit having a resistance controlling center, multiple resistance generator, and an output controlling center; and a battery electrically connects to the resistance generating unit.

Abstract: This invention reveals an electric bicycle system including an electric bicycle and a docking device. When the electric bicycle is uprightly prop against the docking device, the electric bicycle can be driven with a pedal, making the electric bicycle system a training equipment.