formula: Energy efficiency does not have any units. It is a number between 0 and 1 which can be converted into a percentage by multiplying by 100. Useful energy is measured in joules (J). Total energy is measured in joules (J). energy efficiency = useful output energy total input energy Energy Transfers and EfficiencyAQA GCSE Physics (Separate Science) Unit 1: Energy Revision Mat - How can I help my students revise for their Physics exams? Help your students revise by using this great physics AQA revision mat which focuses on unit P1 of the separate science physics course, energy.

You should be able to apply this equation which is given on the Physics equation sheet. The wave speed is the speed at which the energy is transferred (or the wave moves) through the medium. All waves obey the wave equation: wave speed = frequency × wavelength, v = f λAQA 9-1 Equation revision sheet or work sheet Fold the edges to the middle to make 'doors'. Cut along the lines between the words (wave speed, charge flow etc) to make flaps which reveal the equation underneath.