An electric car is a vehicle that is propelled by an electric motor powered by a rechargeable battery. They are one of the many alternatives to gasoline-powered cars that, owing to its zero tail pipe emissions, could help reduce city pollution considerably and, depending on how the electricity is generated, also lessen greenhouse gas emissions. For these reasons billions of dollars has been invested into the development of electric cars worldwide because of the growing concern with oil dependence, gasoline prices and global warming.