Focus Physics

1.7.3.7 — Define efficiency as: (a) (useful energy output) (%) efficiency = ( × 100%) (total energy input) (b) (useful power output) (%) efficiency = ( × 100%) (total power input) recall and use these equations www.cambridgeinternational.org/igcse 17 Subject content

1.7.3.7 — Define efficiency as: (a) (useful energy output) (%) efficiency = ( × 100%) (total energy input) (b) (useful power output) (%) efficiency = ( × 100%) (total power input) recall and use these equations www.cambridgeinternational.org/igcse 17 Subject content