When Do We Say Something Is Energy Efficient? Something is energy efficient if it uses energy efficiently. It can be used to refer to energy conversion efficiency which refers to the proportion between the amount of input of energy used in the system compared to the useful output. Useful output can mean either heat, mechanical power, or electrical power. Energy efficiency was brought to the attention of the average person on the street mainly because of the 1973 oil crisis. Amory Lovins, a physicist, popularized the concept of boosting energy efficiency rather than promoting heightened energy production at around... Read full post here
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