Theory
What is a hybrid vehicle?
A hybrid vehicle is a vehicle that uses two or more distinct power sources to move the vehicle.(combines an internal combustion engine and one or more electric motors.
Power train configurations
Parallel hybrid(petrol->transmission->wheels)
(petrol->batteries->motor->wheels)
In a parallel hybrid, the single electric motor and the internal combustion engine are installed so that they can both individually or together power the vehicle.
Series hybrid(12 cylinder -> generator->batteries->motor)
Series-hybrid vehicles are driven by the electric motor with no mechanical connection to the engine.Instead there is an engine turned for running a generator when the battery pack energy supply isn't sufficient for demands.
Fuel cell, electric hybrid
The fuel cell hybrid is generally an electric vehicle equipped with a fuel cell. The fuel cell as well as the electric battery are both power sources, making the vehicle a hybrid.
Fuel cells use hydrogen as a fuel and power the electric battery when it is depleted.
<source from http://en.wikipedia.org/wiki/Hybrid_vehicle>
Safety issues
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