Energy Basics P1 2.1 - 2.4

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GCSE Physics (P1.2 Using Energy) Mindmap am Energy Basics P1 2.1 - 2.4, erstellt von Jonathan Davies5113 am 30/12/2015.
Jonathan Davies5113
Mindmap von Jonathan Davies5113, aktualisiert more than 1 year ago
Jonathan Davies5113
Erstellt von Jonathan Davies5113 vor fast 9 Jahre
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Zusammenfassung der Ressource

Energy Basics P1 2.1 - 2.4
  1. Forms of energy
    1. Chemical Energy
      1. Stored in fuel (including food)
        1. Released when chemical reactions take place
      2. Kinetic Energy
        1. Energy of a moving object
        2. Gravitational potential energy
          1. The energy of an object due to it's position. Affected by gravity, height and mass
          2. Elastic potential energy
            1. The energy stored in a sprringy object when we stretch or squash it
            2. Can be transferred from one form to another
              1. E.g. a torch
                1. The battery pushes a current through the bulb making the torch bulb emit light and it also gets hot. We can show the energy transfers using a flow diagram
                2. E.g. an falling block
                  1. Has gravitational energy
                    1. Transferred to kinetic as it falls and speeds up
                      1. Transferred into heat and sound when it hits the ground
              2. Conservation of energy
                1. Scientists have found that the total energy after a transfer is the same as the energy before the transfer
                  1. This is known as the conservation of energy
                    1. It tells us that energy cannot be created nor destroyed
                2. Useful energy
                  1. Many things use energy such as machines but energy is wasted. It is not 100% effecient
                    1. In a washing machine the friction between the moving parts causes some of them to heat up. This is wasted energy
                      1. Useful Energy
                        1. The energy transferred to where it is wanted, in the form it is wanted
                        2. Wasted Energy
                          1. Energy that is not usefully transferred
                      2. Spreading out
                        1. Wasted energy is dissipated to the surroundings
                          1. Useful energy eventually transfers to the surroundings too
                            1. E.g. tyres
                            2. Energy becomes less useful, the more it dissipates
                          2. Energy and efficiency
                            1. Weight is measured in newtons (N). THe weight of a 1kg object on the Earth's surface is about 10N
                              1. Energy is measured in joules (J). The energy needed to lift a weight of 1N by a height of metre
                                1. Sankey Diagrams
                                  1. Used to represent effeciency
                                    1. Efficiency = (Useful energy transferred by the device / total energy supplied the the device) x 100%
                                    2. Improving efficiency
                                      1. Efficiency can be imrpoved in a number of ways depending on the source of the energy waste. This can save money and time.
                                        1. e.g. friction between the moving pasts causes heating -> Lubricate the moving parts to reduce friction
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