Energy

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  • Energy
    • Types
      • "Stored"
        • Chemical
        • Gravitational Potential
          • mass x gravitational field strength x height
            • For a falling object, GPE is converted into KE
              • = 1/2 x mass x velocity squared
        • Elastic
          • See Hooke's Law in Forces topic
        • Nuclear
      • "Moving"
        • Light
        • Sound
        • Heat
          • Heat is the flow of energy from High Temperature to Low temperature
            • Conduction
              • transfer through solids by collisions between atoms or free electrons
            • Convection
              • Heat transfer through fluids (liquids and gases). Heated fluid becomes less dense and rises. Convection current
            • Heat radiation
              • Heat transfer by electro-magnetic radiation. Mostly Infrared or microwave
            • Evaporation
        • Kinetic
          • = 1/2 x mass x velocity squared
        • Electrical
          • p.d. (voltage) = Energy / Charge
    • Unit
      • Joule
      • J
    • Law of Conservation of Energy
      • Energy cannot be created or destroyed, only transformed from one type to another
        • Types
          • "Stored"
            • Chemical
            • Gravitational Potential
              • mass x gravitational field strength x height
                • For a falling object, GPE is converted into KE
              • Elastic
                • See Hooke's Law in Forces topic
              • Nuclear
            • "Moving"
              • Light
              • Sound
              • Heat
                • Heat is the flow of energy from High Temperature to Low temperature
                  • Conduction
                    • transfer through solids by collisions between atoms or free electrons
                  • Convection
                    • Heat transfer through fluids (liquids and gases). Heated fluid becomes less dense and rises. Convection current
                  • Heat radiation
                    • Heat transfer by electro-magnetic radiation. Mostly Infrared or microwave
                  • Evaporation
              • Kinetic
                • Electrical
                  • p.d. (voltage) = Energy / Charge
            • Sankey diagrams
              • Efficiency = Useful Energy Output / Total Energy Input
            • The work done is equal to the energy transferred
        • Energy Resources
          • Renewable
            • Solar
              • Photovoltaic (PV)
              • Solar Heating
            • Geothermal
            • Wind
            • Hydroelectric
              • Tidal
            • Wave
            • Biomass
          • Non-renewable
            • Fossil Fuels
              • Natural Gas
              • Crude Oil
              • Coal
            • Nuclear
        • Work Done = Force x distance moved
          • The work done is equal to the energy transferred
          • Power = Work Done / time
            • Unit = Watts
              • 1W = 1 J/s
                • Power = Work Done / time
                  • Unit = Watts
                    • 1W = 1 J/s

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