IGCSE›Edexcel IGCSE Physics›Mind mapsEnergy Stores & TransfersEdexcel IGCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsStores, transfersChemical, kinetic, gravitational, elasticThermal, magnetic, electrostatic, nuclearPathways: mechanical, electrical, heating, radiationFalling ball: gravitational to kineticConservationEnergy cannot be created or destroyedOnly transferred between storesSome is wasted as thermal energyEfficiencyefficiency=useful outputtotal input×100%\text{efficiency} = \frac{\text{useful output}}{\text{total input}} \times 100\%efficiency=total inputuseful output×100%200 J in, 150 J useful gives 75%Sankey arrow width shows energy amountEnergystores and transfersJW%Thermal transferConduction: vibrating particles pass energy onConvection: warm fluid rises, cool sinksRadiation: infrared, works in a vacuumDark matt surfaces emit and absorb bestCut wasteInsulation cuts heat loss in buildingsLubrication reduces frictionStreamlining reduces air resistanceExam tipsName the start store, pathway and end storeConvection cannot happen in solids