Physics P1

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  • Physics P1
  • P1A
  • P1B
  • choosing electrical appliances
    • weigh up pros and cons
    • energy consumption
      • energy=power x time
    • cost effectiveness
      • cost=no. of units x price per unit
        • no. of units used= power(kw) x time (hours)
  • sankey diagrams
    • no. of energy in divided by no. of squares =value of 1 square
  • efficiency= useful energy out ÷ total energy in
    • efficiency= useful energy out ÷ total power in
  • 9 types of energy
    • light
    • electrical
    • sound
    • kinetic
    • nuclear
    • thermal
    • gravitational potential
      • stored energy
    • elastic potential
      • stored energy
    • chemical
    • specific heat capacity
      • shc= energy÷ mass x temp change
    • payback time= initial cost ÷ annual saving
    • heat transfer
      • conduction
      • infared radiation
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