17Energy Work Power EfficiencyEasy1 markWhat is meant by the efficiency of a system?Athe difference between the useful energy output from the system and the total energy inputBthe difference between the useful energy output from the system and the wasted energy outputCthe ratio of the useful energy output from the system to the total energy inputDthe ratio of the useful energy output from the system to the wasted energy outputGrade answerSolutionGrading criteria