Edexcel P1 Topic 6.txt

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Edexcel P1 Topic 6.txt
2013-02-09 14:23:35
Edexcel Physics1 Topic6

Edexcel Physics1 Topic 6
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  1. Name the nine forms of energy
    • thermal
    • light
    • electrical
    • kinetic
    • sound
    • nuclear potential
    • chemical
    • gravitational potential
    • elastic potential
  2. What does the law of conservation of energy say?
    Energy cannot be created or destroyed. It can only be transformed from one form to another.
  3. In a Sankey diagram, why is the width of the arrows important?
    They represent the amount of energy
  4. What is efficiency a measure of?
    • The proportion of energy that is transformed into useful forms.
    • (What is useful will depend on what you are trying to do – in a light the light energy will be useful, in a loudspeaker it will be sound energy)
  5. How is efficiency calculated?
    Useful energy transferred/total energy supplied x 100%
  6. Which colour surface absorbs thermal (heat) energy the best?
  7. Which colour surface emits (radiates) thermal energy the best?
  8. If a system is at a constant temperature, what does it tell us about the amount of energy being absorbed and the amount of energy being radiated?
    Energy radiated = energy absorbed
  9. Car radiators are designed to radiate heat as quickly as possible. Why do they have lots of little fins inside them?
    This increases the surface area so increases how quickly the heat is lost.