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Energy efficiency, in simple word we can say the amount of input energy to a system is not wasted and is utilised completely.
where as law of conservation energy says that, the energy in the universe is constant and the energy is neither is created neither destroyed.
Energy efficiency explain about any machine or any equipment in which the energy which is given to the equipment is not wasted but being utilized completely may be in same form as given or in some other form. Where as law of conservation of energy explain about energy which is conserved but neither created nor destroyed.
Both are visually same but slight difference. Energy efficiency explain only for a particular system, where as Law of conservation of energy is a law which explain how the energy is conserved.
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