A series hybrid combines an internal combustion engine and an electric motor, but only the electric motor drives the wheels.
The engine is used to generate electricity which can power the electric motor or can be stored in a traction battery for later use. There is no mechanical connection between the engine and the wheels, so the engine cannot drive the wheels directly.
Diesel-electric trains are the most common examples of series hybrid vehicles.
See also parallel hybrid and series/parallel hybrid.
