Power and efficiency
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Useful, wasted, and dissipated energy transfers

Useful, wasted, and dissipated energy transfers

Sankey diagram of an electric fan showing electrical energy input splitting into useful kinetic energy of moving air and wasted thermal energy and sound

In a system, energy is transferred between stores when a device works. Total energy is conserved, so energy is not "used up" or destroyed.

Power and efficiency Lesson

  1. GCSE
  2. /Physics
  3. /Power and efficiency