Reducing Energy Waste Methods
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Questions and Answers

Which formula represents the calculation for power?

  • Power = mass × specific heat capacity × temperature change
  • Power = energy transferred + work done
  • Power = energy transferred ÷ time (correct)
  • Power = mass × specific heat capacity

    • In the context of energy transfers, what happens to energy?

  • Energy can be created or destroyed.
  • Energy can be transferred usefully, stored, or dissipated but not created or destroyed. (correct)
  • Energy can only be stored.
  • Energy cannot be stored.

    • What unit is power measured in?

  • Joules per kilogram per degree Celsius
  • Seconds
  • Joules
  • Watts (correct)

    • Why is energy often described as being 'wasted'?

    <p>Because in all system changes energy is dissipated, stored in less useful ways.</p> Signup and view all the answers

    What does a higher power rating imply in a motor?

    <p>The motor can do the same work faster.</p> Signup and view all the answers

    How would better thermal insulation contribute to energy efficiency?

    <p>By reducing the need for energy transfer.</p> Signup and view all the answers

    What is the formula to calculate efficiency of a system?

    <p>Efficiency = useful power output / total power input</p> Signup and view all the answers

    Which of the following materials would allow heat to travel through it more easily?

    <p>Plastic with high thermal conductivity</p> Signup and view all the answers

    How can the efficiency of a machine be increased according to the text?

    <p>By reducing waste output like proper lubrication</p> Signup and view all the answers

    Which energy source is classified as non-renewable?

    <p>Coal</p> Signup and view all the answers

    What effect does double glazing have in terms of energy transfer according to the text?

    <p>Decreases useful thermal energy loss</p> Signup and view all the answers

    How does reducing friction by proper lubrication impact energy loss in a motor?

    <p>Decreases energy lost as heat</p> Signup and view all the answers

    What is the formula to calculate kinetic energy?

    <p>$Ek = \frac{1}{2}mv^2$</p> Signup and view all the answers

    When a moving ball hits a wall, which type of energy transfer occurs?

    <p>Kinetic to sound energy</p> Signup and view all the answers

    What is the formula for elastic potential energy stored in a spring?

    <p>$Ee = ke^2$</p> Signup and view all the answers

    What does the specific heat capacity measure?

    <p>Energy required to raise temperature per unit mass</p> Signup and view all the answers

    What happens to kinetic energy when a vehicle slows down due to friction?

    <p>It transforms into thermal energy</p> Signup and view all the answers

    In the context of energy transfers, what is one way to reduce energy waste?

    <p>Increasing system efficiency</p> Signup and view all the answers

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