P1.2 - Using Energy

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  • P1.2 - Using Energy
    • 2.1
      • Energy exists in many forms:
        • Light
        • Sound
        • Kinetic
        • Nuclear
        • Electrical
        • Gravitational Potential
        • Elastic Potential
        • Chemical
      • Energy can be transferred from one form to another.
      • Any object above the ground has gravitational potential energy.
      • A fall objects transfers GPE to kinetic.
    • 2.2
      • You cannot destroyed or created, but you can transform it.
      • Conservation of energy:
        • The total amount of energy is always the same.
        • Applies to all energy transfers.
      • Energy can be transferred from one form to another.
    • 2.3
      • Useful energy is energy in the place we want i and the form we need it.
      • Wasted energy is energy that is not useful energy.
      • Useful energy and wasted energy both end up being transferred to the surroundings.
      • As energy spreads out, it gets more and more difficult to use for further energy transfers.
    • 2.4
      • Efficiency: Useful energy transferred by the appliance / total energy supplied to the appliance (x100)
      • No machine can be more than 100% efficient.
      • Measurement to make machine more efficient:
        • Reduce friction.
        • Reduce air resistance.
        • Reduce electrical resistance.
        • Reduce noise due to vibrations.
        • Represented by sankey diagrams:


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