The combination of these two chemicals (hydrogen and oxygen) results in HFCVs exhausting water vapor. The former setup uses onboard fuel cells to react with hydrogen fuel (stored in an onboard tank) with oxygen to produce electricity to power such a vehicle's electric drive motor. Those in search of emission-free electric driving currently have two options to choose from: hydrogen fuel-cell electric vehicles (HFCVs or FCEVs) and battery-electric vehicles (BEVs). Once enough of the battery's energy is drained, PHEVs rely on the gasoline engine to serve as a generator and/or power source for the drive wheels. ![]() PHEVs allow for short-range operation on battery power alone. Plug-in-hybrid vehicles (PHEVs) take this same concept and add the option to pull power from an external source, such as the energy grid itself, courtesy of an external charge port. ![]() ![]() A hybrid, such as the Toyota Prius, burns fossil fuel to power the vehicle's internal-combustion engine, which subsequently plays a part in generating the electricity needed to power the car's electric drive motor (an onboard battery pack stores this energy).
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