Electric Bicycle System

An electric bicycle system comprising an electric bicycle, wherein the electric bicycle comprises a motor, a resistance generating unit, and a control center, wherein:

• the control center is able to switch the electric bicycle to either a riding mode or a resistance mode, wherein in the resistance mode, the resistance generating unit provides multiple levels of resistance to a rear wheel of the electric bicycle;
• the motor connects to a battery, and the motor generates assisting force to propel the electric bicycle forward;
• and
• the resistance generating unit comprises a resistance controlling center, wherein the resistance controlling center controls movements of a clutch, controls the status of multiple resistance generators, and controls an electrical energy output by an output controlling center to tune multiple levels of the resistance, wherein:
• the clutch engages with the rear wheel of the electric bicycle in the resistance mode and creates a first level of the resistance, and the clutch disengages from the rear wheel in the riding mode, wherein the clutch is connected to an accelerator, and the accelerator increases the rotational speed of a coil winding in the resistance generator;
• the resistance generator connects to the clutch and comprises the coil winding, wherein the coil winding generates electrical energy during rotation;
• and
• the output controlling center regulates output values of voltage and/or current to modify the load output and generates adjustable multiple levels of the resistance and stores the electrical energy into the battery.