Thermal energy

  • Created by: highamR15
  • Created on: 27-01-19 08:03
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  • Thermal energy and energy resources
    • Thermal physics
      • Thermal =heat
        • Heat moves from a hot object to a cold object always
          • Heat is not a movement of proportion as it puts in the work from hot to cold and cold to hot.
            • Hot=high energy
            • Cold =low energy
        • Heat=energy
    • Heat transfer
      • 3 methods of heat transfer
        • Conduction
          • Solid materials
          • Molecules in a solid always vibrate (except at absolute zero). When energy us out in the molecules vibrate faster and further.
            • Faster=K.e
              • K.e. and P.e. are internal energy.
                • Further=P.e.
            • Further=P.e.
          • Because of the lattice structure the energy is passed along the materiel.
        • Convection
          • Liquids and gases
          • Particles get hot, less dense, so rise, cools due to giving away the energy to other particles and sinks due to being more dense again.
            • Called the convection current.
        • Radiation
          • Gases and vacums
          • All hot objects radiate heat by an electro magnetic waves called Infra red. It travels in straight lines.
          • Cold  objects
            • Colour affects the absorption of emissions of I.R. Black is a good absorber of heat and silver is a poor absorber of heat.
          • Hot objects
            • Black is a good emitter of heat and silver is a poor emitter of heat.
    • Reducing heat loss
      • Conduction
        • To reduce conduction use a poor conductor
      • Convection
        • Put a lid on the container to stop or reduce particle movement.
        • Insulate well
      • Radiation
        • Colour it silver or a light colour.
    • Specific heat capacity
      • The amount of energy needed to raise the temperature of 1Kg of material by 1*C.
      • Shc of water is 4200J/Kg*C
      • Energy put into a material= mass X specific heat capacity X temperature rise
      • E=mc(delta T)
        • Delta means change in

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