Electric bicycle
An electric bicycle or e-bike is a bicycle that uses electricity as its power. These bikes do not pollute the air. Usually a biker can control how much the motor helps. For example, it can be 50% of the force needed. In some cases it is possible to convert a traditional bike to electric using a conversion kit.  In the United Kingdom a new one costs between £599 and £2,500.  The cost of charging a battery is very small compared with the cost of petrol for a car.  Some governments will help with the cost of buying one.