Tuesday, 22 May 2012

Electric Vehicles

Electric vehicles (EVs) are propelled by an electric motor (or motors) normally powered by rechargeable battery packs. Electric motors have several advantages over internal combustion engines (ICEs):

  • Energy efficient. Electric motors convert 75% of the electrical energy from the batteries to mechanical energy to move the wheel. Most internal combustion engines only convert 20% of it chemical energy to power up the wheel.
  • Environmentally friendly. Electric vehicles emit no pollution nor greenhouse gases.
  • Quiter. EVs also run more quietly than their combustion-powered counterparts.
  • More reliability. Electric motors have fewer moving parts compared to ICEs. And they don't need fluids such as engine oil or anti-freeze.

Besides electric cars, electric motors have also been used for the propulsion of trains, lorries, aeroplanes, boats, motorcycles and scooters, and spacecrafts.


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