Lights and computers use electrical energy. The production of heat is an unwanted side effect, but it gets produced from the use of this same electrical energy.
Thermal energy heats your house in the winter.
Computers do not produce energy, they use/consume energy.
Chemical energy to electrical energy.
Electricity powers a light bulb by flowing through a filament within the bulb, which heats up and produces light as a result of resistance. When the electric current flows through the filament, it increases the temperature of the filament, causing it to emit light.
Heat energy, more specifically you can use radiant (usually electric), Convection (forced or natural [either gas or electric]) or conduction (electric usually)
Turning off unused lights reduces energy consumption, which falls under the category of energy efficiency. Energy efficiency aims to decrease the amount of energy used for a given task without sacrificing performance or comfort.
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Pretty much the same kind you find everywhere else. Cars, airplanes, buses, computers, traffic lights, tractors, natural gas wells, helicopters, guns, etc...
Usually - but not always - electricity powers our lights and appliances.
heat wave
In Reykjavík all homes and businesses are heated by geothermal energy. Steam and hot water is drawn from beneath the surface and distributed via underground pipelines.
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