Electric vehicles are going to be the future of mobility in the world. There are many reasons:
1. Electric motors are among the most efficient prime movers available today. When comparing a normal car engine and an electric motor, the maximum overall efficiency realizable from an engine is around 30% whereas it is nearly 90% in a motor.
2. Torque-speed characteristics of engines make them almost unsuitable for vehicle propulsion, because at zero speed, engines don’t deliver any torque. In contrast electric motors deliver maximum torque at zero speed, the ideal condition for vehicle propulsion.
3. As you know, engines useful even when in idle operation, since the engine has to be kept rotating. Electric motors use little or no energy in idling.
4. When the power developed in an engine is transferred to kinetic energy if a moving vehicle, there is no way to recover it when breaking. Electric vehicles can use regenerative breaking to convert
Although there are many plus points in electric vehicle technology, there are many negative aspects: they include the burden of heavy batteries, reliability of battery technology, long charging duration and short vehicle range, when compared to an engine driven vehicle. Another key factor is the cost of electric vehicles. Although Sri Lankans perceive electric vehicles to be cheaper than conventional vehicles, it happens so because of the heavy taxation imposed on engine vehicles.