Energy

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  • Energy
    • Kinetic Energy
      • 1/2 x Mass x Velocity Squared
      • Movement Energy
        • e.g. in a car
    • G.P.E
      • When an object is lifted off the ground
      • Mass x Gravitational Field Strength x Height
    • E.P.E
      • In Springs
        • Required Practical - Finding E.P.E in a spring
      • 1/2 x Spring Constant x Extension Squared
    • Work and Power
      • Work Done = Force x Distance Moved
      • Power = Work Done ÷ Time
      • Power is the rate of doing work - a more powerful object does more work a second
      • Work done is the same as energy transferred
    • Specific Heat Capacity
      • The energy needed to raise 1kg of an object's temp by 1 degree
      • Change in Thermal Energy = Mass x SHC x Temperature Change
      • Required Practical - Finding SHC of Solids
    • Efficiency
      • The % of energy in converted to useful energy
      • Useful Energy Out ÷ Total Energy In
      • Nothing is 100% efficient, but higher efficiencies are more desired
        • Less energy used
    • Non -Renewables
      • Will run out
      • Coal
      • Oil
        • Currently provide most of our energy
          • Coal
          • Natural Gas
            • They produce CO2 (as they are fossil fuels) which harm the environment
              • Oil
                • Currently provide most of our energy
                  • Natural Gas
                    • They produce CO2 (as they are fossil fuels) which harm the environment
      • Renewables
        • Won't run out
        • Solar
        • Geothermal
          • Reliable
        • Wind
          • Not very reliable
            • Solar
        • Hydro
          • Reliable
        • High intial costs
        • Doesn't make as much CO2
      • Reducing Unwanted Energy Transfers
        • Sometimes energy can escape through conduction and convection
          • This costs more in central heating, electricity etc
        • Install insulation - prevents convection
        • Double glazing
        • Cavity wall insulation
        • Draught excluders

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