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Power
Explore power within work, energy and power. Follow energy transfers through a system. Work connects a force acting through a displacement to an energy change, and power measures how quickly energy transfers.
Specification outcomes (3)
- 3.3.3(a) Define power, the unit watt, and use P = W / t.
- 3.3.3(b) Use and derive P = Fv from first principles.
- 3.3.3(c) Calculate efficiency of a mechanical system using percentage efficiency = (useful output energy / total input energy) × 100.
H156 v2.0 · May 2026
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