Efficiency

    Cards (13)

    • What does efficiency tell us about energy transfer?
      Fraction of energy converted to useful forms
    • What is the equation for efficiency?
      Efficiency = useful output / total input
    • What is another equation for efficiency involving power?
      Efficiency = useful power output / total power input
    • How can efficiency be expressed as a percentage?
      Multiply decimal efficiency by 100
    • What happens if you calculate efficiency upside down?
      You get a value greater than 1
    • Why are LED bulbs considered more efficient?
      More energy is converted to light
    • What are ways to increase the efficiency of energy transfer?
      • Use a pan with a wider base
      • Use a lid on the pan
      • Place heating element inside water
      • Use materials with lower thermal conductivity
    • What happens to thermal energy when using a pan to heat water?
      Some energy is wasted to the air
    • How does a kettle improve efficiency compared to a pan?
      Heating element is inside the water
    • Why is metal less efficient than plastic for heat transfer?
      Metal conducts heat better than plastic
    • What is the significance of thermal conductivity in energy transfer?
      It affects how much energy is wasted
    • How does using a lid on a pan affect energy transfer efficiency?
      It reduces unwanted thermal energy loss
    • What is the role of a wider base on a pan in energy transfer?
      It reduces unwanted thermal energy loss
    See similar decks