Physics P1

Physics P1

1. Heating Houses

   • Energy Flow
     • Heat energy flows from a warmer body to a colder body
       • When this happens, the temperature of that object decreases
   • Measuring Temperature
     • a thermogram uses colour to show temperature; hottest ares are white/yellows, coldest are black/dark blue/purple
     • 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
     • Heat is a measurement of internal energy measured on an absolute scale
   • Specific Heat Capacity
     • 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
     • 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
   • Specific Latent Heat
     • 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
     • 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

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