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42_efficiency - Lesson 42 Efficiency Efficiency is a very...

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Lesson 42: Efficiency Efficiency is a very popular topic in our modern world. Many companies selling a wide range of products, from light bulbs to cars, advertise the efficiency of their products. Increasing energy costs are making efficiency an important factor to consider when purchasing a product. In the past, when energy costs were lower, people focused more on the immediate “up-front” cost of a product. Many people are now willing to pay extra for a product at the start with the knowledge they will save money in the long run on energy cost. People still don't necessarily understand what efficiency really means. Efficiency can be measured in terms of either energy or power. In either case it is a measurement of how much useful stuff comes out ( output ) compared to what was originally put in ( input ). efficiency = Energy Output E out Energy Input E in efficiency = Power Output P out Power Input P in
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