OCR•GCSE•Physics
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P7: Energy
Work done, power and efficiency
Practice 33 subtopics in P7: Energy. All questions match the OCR GCSE specification.
About P7: Energy
P7: Energy is a key topic in the OCR GCSE Physicsspecification. This topic covers work done, power and efficiency.
Master all 33 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
All Subtopics (33)
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Energy stores: kinetic, gravitational, elastic, thermalEnergy stores: chemical, magnetic, electrostatic, nuclearEnergy transfers: mechanically, electrically, by heating, by radiationConservation of energy in closed systemsWork done and energy transferWork done = force × distance: W = FdWork against friction and heatingKinetic energy: Ek = ½mv²Calculating kinetic energyGravitational potential energy: Ep = mghCalculating GPE changesEnergy transfer between Ek and EpElastic potential energy: Ee = ½kx²Energy dissipation to surroundingsPower as rate of energy transferPower = energy / time: P = E/tPower = work done / time: P = W/tPower = force × velocity: P = FvWatt as unit of powerComparing power of appliancesEfficiency definition and calculationEfficiency = useful output / total inputEfficiency as percentage or decimalWasted energy in systemsReducing wasted energyLubrication and friction reductionThermal insulation: reducing heat lossRequired practical: thermal insulationThermal conductivity and materialsU-values and building insulationDomestic energy use and costsKilowatt-hours (kWh)Calculating energy costs
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