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3.2 Dissipation and efficiency
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Useful and wasted transfers

Useful and wasted transfers

Sankey diagram of an electric motor with 100 J electrical input, 70 J useful kinetic output and 30 J wasted as thermal energy and sound In any device, energy is transferred from one store to another. The useful transfer is the part that does the job we want, while wasted energy is usually dissipated to the surroundings as heating or sound.

3.2 Dissipation and efficiency Lesson

  1. GCSE
  2. /Physics
  3. /3.2 Dissipation and efficiency

Step-by-step lessons on Edexcel GCSE Physics 3.2 Dissipation and efficiency. Each one builds up to exam-style questions. Master the required practical work and core equations early, since both papers can draw on content and maths skills from across the whole specification.

Lessons