GCSE›AQA GCSE Physics›Mind mapsPower and Work DoneAQA GCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWork doneWork is done when a force moves an objectWork is also done when a current flowsWork means energy is being transferredWhat is power?Power is the rate of energy transferP=EtP = \frac{E}{t}P=tEP=WtP = \frac{W}{t}P=tW1 watt = 1 joule per secondPower and workrate of energy transferWJsPPPWork and storesLifting: work done equals gravitational energy gainedEp=mghE_p = mghEp=mghAccelerating from rest: work equals kinetic energy gainedEk=12mv2E_k = \frac{1}{2}mv^2Ek=21mv2Comparing machinesSame energy in less time means greater power6000 J in 3 s gives 2000 W6000 J in 12 s gives only 500 WExam tipsA time given with force or mass usually means powerConvert time into seconds before using P=EtP = \frac{E}{t}P=tEWork and energy are both measured in joules