How

In some vehicles the electric motor only supports the engine fuel, although others can work only if the activity does not require much effort.

The electric motor gets the energy through some batteries installed in the vehicle, which can be recharged through the electric current.

It also can be loaded through the currents that produce cars for example to accelerate or slow down. While some batteries are charging others are in operation making the vehicle could move. There are ways to save energy, which vary according to the manufacturer's car.

Some vehicles have developed the ability to circulate with the electric motor until they need great acceleration when he starts to run the heat.