There have been several proposed alternatives to conventional petrol-or diesel-powered cars, including cars that use solar or battery power. The object is to lower harmful emissions and conserve natural resources. One of the alternatives already in production is the hybrid car. A hybrid vehicle uses two or more fuels. Examples include diesel-electric trains and mopeds. The latter combine the power of a petrol engine with pedal power. In a hybrid car, petrol consumption is reduced by the provision of additional power by an electric motor during acceleration. The motor is driven by power from on-board batteries that are recharged by an engine-driven generator when the car is decelerating or cruising. Some hybrid cars transfer energy from the wheels to a fly wheels during braking. The flywheel drives the generator, which recharges the batteries.
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