Law of conservation of energy

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physics science revision

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10 Terms

1
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types of heat transfer

conduction, convection, radiation

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conduction

requires contact, works best in solids

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convection

works best in liquids and gas, requires movement of currents ( heat particles rise, cooler particles fall the cycle repeated until all particles are heated)

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radiation

requires no medium to travel, it is infrared radiation (rays)

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law of conservation of energy

energy cannot be created nor destroyed, it can only be transferred or transformed.

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energy transfer

when energy moves from one object to another and does not change its form

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energy transformation

when one form of energy is changed/converted into another form of energy

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heat

transfer of energy from one region to another region with lower temperature

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calculate energy efficiency

useful energy/total energy X 100 = —-%

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what is energy efficiency

never 100% efficient as some energy is always wasted in the process