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Energy Efficiency is about using less and less energy to produce the same amount of useful work.
In mathematical language, it is the ratio of "useful energy" in producing the desired effect divided by the "total energy" supplied to get the job done.
Let me quote2 examples
Think of energy efficiency in terms of inventions or tools that will increase the useful part and reduce the "wasted" part of the energy supplied to produce the desired effect; car jack, hydtaulic jacks,LED lights, lubrication oils, ... etc .. etc.