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Energy 1

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Transcript

  • 1. Energy
  • 2. Whatisenergy?
    Energyistheabilityto do work
    Where do thefollowinggettheirsources of energyfrom?
    A car
    A person
    Whatisthetype of worktheyboth do?
  • 3. Amount of Energyactivity
    In yourgroups, orderthedifferentactivities in terms of howmuchenergythey use (3 minutes)
    Energy to make the human heart beat once
    Energy stored in 1 litre of petrol
    Energy used by the human body for one day
    Energy to lift up an apple by one metre
    Energy stored in a peanut
    Kinetic energy of a fast-moving cricket ball
    Energy to drive a car 60 miles
    Energy in 1 unit on your electricity bill (costs about 15p)
    Energy a person uses to press a key on a computer keyboard
    Energy from burning one whole match
    Energy to boil 1 litre of water, starting from freezing point
    Energy in a typical chocolate bar
    Energy stored in one new AA battery
  • 4. Energy to drive a car 60 miles: 250,000,000 J
    Energy stored in 1 litre of petrol: 34,000,000 J
    Energy used by the human body for 1 day: 10,000,000 J
    Energy in 1 unit on electricity bill (costs 15c): 3,600,000 J
    Energy in a typical chocolate bar: 1,000,000 J
    Energy to boil 1 l of water, from freezing: 500,000 J
    Energy stored in a peanut: 25,000 J
    Kinetic energy of a fast-moving cricket ball: 1000 J
    Energy stored in one new AA battery: 1000 J
    Energy from burning one whole match: 1000 J
    Energy to lift up an apple by one metre: 1 J
    Energy to make the human heart beat once: ½ J
    Energy to press key on computer keyboard: 1/100 J
  • 5. Howisenergymeasured?
    Theunit of energyisthejoule (J)
    There are 1000J in a kilojoule (kJ)
    Toconvertfrom J tokJ:
    Divide by 1000
    Example: 3500J = 3500kJ = 3.5 kJ
    1000
    ToconvertfromkJto J:
    Multiplyby 1000
    Example: 2.7kJ = 2.7 * 1000 = 2700J
  • 6. Convertingjoulestokilojoules
    Copy and complete thefollowingtable:
  • 7. Convertingjoulestokilojoules
    Copy and complete thefollowingtable:
  • 8. Forms of energy
    There are 9 forms of energy:
    HEAT
    LIGHT
    SOUND
    ELECTRICAL
    KINETIC (also called MOVEMENT)
    ELASTIC POTENTIAL
    GRAVITATIONAL POTENTIAL
    NUCLEAR
    CHEMICAL.