I imagine in the same way a house does - which is in a variety of ways. Could be all-electric, could use an oil or natural gas fired furnace. In the old days it would have been a coal or wood fired stove with the older pupils keeping it fired up!
Hydro energy is energy made by water.
Chemical energy. The petrol / diesel that you fill up the tank with.
green energy source
The term clean source of energy refers to only primary energy sources as wind or solar energy. Electricity, by definition, is not a primary energy source. It is a secondary energy source that is could be produced by a clean energy source as wind or any renewable primary energy source or produced by fossil energy source as oil, natural gas, or coal.
waves is not a source of energy
No its not a source of energy..... geez...
no its a renewable source of energy
The source of energy in stoves is HEAT ENERGY
noelectricity is a source of energy
The Sun is one source of energy.
What source: Energy From where: Sun
A fire is a source of light energy.