Physics P1

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Physics P1 GCSE Revision. Heating Houses created so far.

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P1.1 The Transfer Of Energy By Heating Processes
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1 Heating Houses
1.1 Energy Flow
1.1.1 Heat energy flows from a warmer body to a colder body When this happens, the temperature of that object decreases
1.2 Measuring Temperature
1.2.1 a thermogram uses colour to show temperature; hottest ares are white/yellows, coldest are black/dark blue/purple
1.2.2 Temperature is a measurement of hotness on an arbitrary scale. You do not need to use a thermometer When the temperature of a body increases, the average kinetic energy of the particles increases
1.2.3 Heat is a measurement of internal energy measured on an absolute scale
1.3 Specific Heat Capacity
1.3.1 All substances have a property called SHC It is the energy needed to raise the temperature of 1kg by 1 degree Celsius It is measured in joules per kilogram degree Celsius (J/kg degree Celsius). It differs for different materials
1.3.2 When a object is heated and its temperature rises, energy is transferred The equation for energy transfer by SHC is: energy transferred = mass x SHC x temperature change
1.4 Specific Latent Heat
1.4.1 It is the energy needed to melt or boil 1 kg of the material It is measured in joule per kilogram (J/kg) and differs for different materials and each of the changes of state The equation for energy transfer by specific latent heat is: energy transferred = mass x specific latent heat
1.4.2 When an object is heated and it changes state, energy is transferred, but the temperature remains constant This is because when a substance changes state, energy is needed to break the bonds that hold the molecules together