GCSE Combined Science (AQA)

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Improving Efficiency

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Energy Conservation and dissipation of energy

Improving Efficiency

3:03 Efficiency
Spec 4.1.2.2
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  • Improving process efficiency reduces energy needed.
  • Processes like boiling water require consistent output; reducing input is key.
  • Efficiency can be improved by increasing useful output energy or decreasing wasted energy.
  • Decreasing input energy also increases efficiency.
  • Example: Using a crane instead of manual lifting reduces input energy, increasing efficiency.
  • Efficiency improves by reducing resistive forces and heat loss.
  • Example: Lubricating car engines reduces friction and heat loss.
  • Streamlining car bodies reduces air resistance.
  • Low friction wheels reduce heat loss.
  • Driving slowly can reduce energy waste from air resistance.
  • Insulating homes reduces waste energy.
  • Less waste leads to more useful output and higher efficiency.
  • Understanding methods to reduce input and waste energy is important for exams.

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