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physics science revision
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types of heat transfer
conduction, convection, radiation
conduction
requires contact, works best in solids
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)
radiation
requires no medium to travel, it is infrared radiation (rays)
law of conservation of energy
energy cannot be created nor destroyed, it can only be transferred or transformed.
energy transfer
when energy moves from one object to another and does not change its form
energy transformation
when one form of energy is changed/converted into another form of energy
heat
transfer of energy from one region to another region with lower temperature
calculate energy efficiency
useful energy/total energy X 100 = —-%
what is energy efficiency
never 100% efficient as some energy is always wasted in the process