The Energy-Saver light bulb is 5 times more efficient than an ordinary filament bulb.
P1 Efficiency
To calculate efficiency, draw an energy transfer diagram/equation that shows what happens
during the energy transfer.
Example: Car Engine
Chemical energy becomes kinetic energy + sound energy + heat energy
(stored in petrol) (useful energy) (wasted energy) (wasted energy)
Efficiency = (useful energy transferred ÷ total energy input) x 100%
To
calculate efficiency, draw an energy transfer
diagram/equation that shows what
happens