power and work done

Cards (28)

  • What is the focus of today's video?
    Understanding power and its calculations
  • How many definitions of power are there?
    Two definitions
  • What is the first definition of power?
    Rate at which energy is transferred
  • What is the equation for power based on energy transferred?
    Power = Energy transferred / Time
  • What is the second definition of power?
    Rate at which work is done
  • What is the equation for power based on work done?
    Power = Work done / Time
  • How is work done defined in this context?
    Energy transferred using a force over distance
  • If you push a car down the road, what is the energy referred to as?
    Work done
  • How is electrical energy transferred from a plug socket described?
    As energy transferred
  • In what unit is power measured?
    Watts
  • What units are used for energy transferred and work done?
    Joules
  • In what unit is time measured?
    Seconds
  • How do you compare the power of two lamps?
    • Use the energy transferred equation
    • Calculate power for each lamp
    • Compare the results
  • How much energy does the left lamp transfer?
    1200 joules
  • How long does the left lamp take to transfer energy?
    20 seconds
  • What is the power of the left lamp?
    60 watts
  • How much energy does the right lamp transfer?
    1500 joules
  • How long does the right lamp take to transfer energy?
    30 seconds
  • What is the power of the right lamp?
    50 watts
  • How do you rearrange the energy transferred equation?
    Energy transferred = Power × Time
  • How do you convert three minutes to seconds?
    Multiply by 60
  • What is the energy transferred by an 1100 watt microwave in three minutes?
    198,000 joules
  • How do you convert joules to kilojoules?
    Divide by 1000
  • What is 198,000 joules in kilojoules?
    198 kilojoules
  • How much work is done to push a car down the street?
    9 kilojoules
  • How much power is used when pushing the car?
    450 watts
  • What are the key equations for calculating power?
    1. Power = Energy transferred / Time
    2. Power = Work done / Time
    3. Energy transferred = Power × Time
  • What is the total power used when pushing a car?
    450 watts