P1.2 Using Energy

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  • P1.2 Using energy
    • Forms of energy
      • Chemical energy
        • stored
        • released through chemical reactions
      • Kinetic energy
        • energy from a moving object
      • Gravitational potential
        • energy due to the position
      • Elastic potential
        • Stored in a springy object
      • electrical
        • transferred by an electric current
    • conservation of energy
      • energy cannot be created or destroyed
    • useful energy
      • energy transferred to where it is wanted
    • wasted energy
      • energy not usefully transferred
    • energy and efficiency
      • weight
        • Newtons (N)
      • Energy
        • Joules (J)
      • efficiency
        • useful energy / total energy (x100)
      • more efficient by reducing
        • friction
        • air resistance
        • electrical resistance
        • noise
    • input energy
      • useful energy + energy wasted

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