EntityQ5042828· pop 9· linked from 89 articleselectrical efficiencySign in to saveuseful power output per electrical power consumedConnectionsmaximum power transfer theoremEntityelectricityEntityGreek alphabetEntityelectronicsEntityelectrical engineeringEntitytransformerEntitybatteryEntityfractionEntityInternational Organization for StandardizationEntitysystemEntityloudspeakerEntityΗEntitylumenEntityelectric lightEntitysignalEntitythermal power stationEntitykilowatt-hourEntityelectronic amplifierEntitypower supplyEntityenergy efficiencyEntityCategoriesElectrical engineeringEnergy economics