Transcription of Chapter 2 CONCEPT OF ENERGY - Pennsylvania State University
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Chapter 2 CONCEPT OF ENERGY - Pennsylvania State University
Chapter 2 CONCEPT OF ENERGYC entre Daily Times8/11/96 Copyright: Mort Walker. Reproduced with permission of the 2 Beetle Bailey is not the only one who wants to save ENERGY . ENERGY conservation andefficiency is on many people's minds lately, especially when ENERGY becomes ENERGY conservation and modern ENERGY -guzzling society compatible? To begin toanswer this question, we must first define ENERGY ( Chapter 2 and 3) and then see what wemean by ENERGY efficiency ( Chapter 3 and 4).Qualitative Definition of EnergyMost dictionaries define ENERGY as the capacity to do work. This implies that ENERGY is amore abstract CONCEPT than work. The definition is correct, of course, but it is is certainly an important manifestation of ENERGY ; indeed, the Industrial Revolutionwent into full swing in late eighteenth century when breakthroughs were achieved inconverting other forms of ENERGY into work. But work is not the only palpable form ofenergy.
This concept has evolved from those of the archaic fire, the more modern vis viva (“living force”), which was dominant until the nineteenth century, and force, which persisted well into the 19th century and today has a much narrower scope. It was Aristotle (384-322 BC) who developed the concept of ‘fire’ as one
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