The definition of a hybrid car is a car that relies upon more than one source of energy to run. There are many different things that hybrid cars run on to get their energy.
One energy source is known as on-board or out-board rechargeable energy storage system (RESS). This type of energy source stores energy and it is also rechargeable. These production energy savers use rechargeable transaction batteries, electric double-layer capacitors, or flywheel energy storage.
Another energy source for hybrid automobiles is petrol or gasoline. Petrol is a petroleum base liquid mixture that relies on fuel for energy. Petrol is normally used in internal combustion engines. Diesel is another source of energy something like petrol. The only difference is that this type of fuel is used only in diesel engines.
A third energy source of hybrid automobiles is hydrogen. Hydrogen is a chemical element which contains the atomic number 1. In hybrid automobiles, hydrogen is used as an onboard fuel for its power.
Compressed air is a fourth energy source of hybrid automobiles. Automobiles that have a compressed air engine use a pneumatic actuator. The expansion of compressed air is used to make the actuator work.
A fifth type of hybrid automobile is one that runs on liquid nitrogen that is stored in the tank. Liquid nitrogen is nitrogen in the liquid from at a very low temperature.
Hybrid automobiles can also be run by using human power, which is simply using human muscles to pedal or row with to make the automobile move.
Another source for hybrid automobiles is the use of wind. Just like a sailboat relies upon wind to make it sail, some hybrid automobiles can also use wind to make the automobile work.
Hybrid automobiles can also rely upon electricity which relies upon electric charges to make the automobile run. Hybrid automobiles can also run on compressed or liquefied natural gas. Liquefied natural gas, mainly methane, is converted into its liquid form for easier storage and usage. Another energy source that can fuel hybrid automobiles is solar. Solar power gets its energy naturally from the sun. Waste heat, another energy source for hybrid automobiles, comes from the heat from internal combustion engines. This type of heat is produced by machines, electrical equipment, and industrial processes in which the heat made is considered to be waste because there is no useful intention for the remaining heat. Hybrid automobiles can also get its energy to work from coal, wood, or other solid combustibles, and also from electromagnetic fields such as radio waves.