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Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, which uses energy stored in batteries. A hybrid electric vehicle cannot be plugged in to charge the battery. Instead, the battery is charged through regenerative braking and by the internal combustion engine.

Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, which uses energy stored in batteries. A hybrid electric vehicle cannot be plugged in to charge the battery. Instead, the battery is charged through regenerative braking and by the internal combustion engine. The extra power provided by the electric motor can potentially allow for a smaller engine. The battery can also power auxiliary loads and reduce engine idling when stopped. Together, these features result in better fuel economy without sacrificing performance.

A hybrid automobile is one that uses both an internal-combustion engine and an electric motor for propulsion, but the only fuel you'll put in is gasoline. (Diesel hybrids do exist, but they're mainly found in locomotives and other extreme heavy-duty applications.) Hybrids have small high-voltage batteries to power their electric motors, but you don't plug them in.

A hybrid vehicle is one that uses two or more distinct types of power, such as submarines that use diesel when surfaced and batteries when submerged. Other means to store energy include pressurized fluid in hydraulic hybrids.

Hybrid power trains use diesel–electric or turbo-electric to power railway locomotives, buses, heavy goods vehicles, mobile hydraulic machinery, and ships. A diesel/turbine engine drives an electric generator or hydraulic pump, which powers electric/hydraulic motors—strictly an electric/hydraulic transmission (not a hybrid), unless it can accept power from outside. With large vehicles, conversion losses decrease and the advantages in distributing power through wires or pipes rather than mechanical elements become more prominent, especially when powering multiple drives—e.g. driven wheels or propellers. Until recently most heavy vehicles had little secondary energy storage, e.g. batteries/hydraulic accumulators—excepting non-nuclear submarines, one of the oldest production hybrids, running on diesel while surfaced and batteries when submerged. Both series and parallel setups were used in World War II-era submarines.

A hybrid car uses more than one means of energy, combining a petrol or diesel engine with an electric motor, and the two systems work with each other to move the vehicle. This allows the car to burn less gasoline, achieving better fuel efficiency than a traditional engine that solely uses fuel does. Electric power serves to boost the performance of the engine. Hybrids, except for plug-in hybrids, charge the battery through its internal system, so they do not need recharging. Plug-in hybrids are a halfway house between conventional cars and all-electric vehicles.

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