Physics: Year 9 Term 1: Energy & Efficiency 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: Charlotte HerondaleCreated on: 21-10-17 14:02 What is the equation for efficiency? (1) Efficiency (%) = (Total useful output (J) / Total input) x 100 1 of 5 What is the highest efficiency a machine can be? (1) 100% 2 of 5 List 4 ways machines waste energy. (4) Friction between parts, Hot wires, Air resistance, Sound 3 of 5 The greater the [what?] the more efficient. % result (or decimal) 4 of 5 Efficiency can be improved by... (1) Reducing waste energy 5 of 5
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