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Energy can also be stored, provided it can be converted on demand and the storing medium's energy density and power density are sufficient to meet the vehicle's needs.
Human power is a simple source of energy that requires nothing more than humans.
) is a mobile machine that transports people or cargo.
Typical vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses), railed vehicles (trains, trams), watercraft (ships, boats), aircraft and spacecraft.
Fuel cells are similar to batteries in that they convert from chemical to electrical energy, but have their own advantages and disadvantages.
Electrified rails and overhead cables are a common source of electrical energy on subways, railways, trams, and trolleybuses.
They are fairly cheap, easy to maintain, reliable, safe and small.
Like fuel, batteries store chemical energy and can cause burns and poisoning in event of an accident.
Moreover, flywheels leak energy fairly quickly and affect a vehicle's steering through the gyroscopic effect. Wind energy is used by sailboats and land yachts as the primary source of energy.
It is very cheap and fairly easy to use, the main issues being dependence on weather and upwind performance.
Regenerative braking is an example of capturing kinetic energy where the brakes of a vehicle are augmented with a generator or other means of extracting energy.
Most motor vehicles have internal combustion engines.