EE1101: Emerging Technologies in Electrical Engineering - 2011-12Chapter1: Power & Energy –S K PandaI tdtit & Introduction to power & energy • What is Energy ?Energy is defined as “something that has the ability todo work”.• Why do we need it ?In order to remain alive we need it!!To get trivial and routine work to be carried out bymachines - to improvestandard of livingof human beings• Humans learned to master various forms of energythat nature provided us.•Homo erectusabout 1.8 millions years ago knew howtouse and control fireChapter-1-Pg.2.
EE1101: Emerging Technologies in Electrical Engineering - 2011-12Chapter1: Power & Energy –S K PandaHii l i EHistorical events in EnergyCited from http://www.eia.doe.gov/kids/history/timelines/index.html
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EE1101: Emerging Technologies in Electrical Engineering - 2011-12Chapter1: Power & Energy –S K Panda• Latter they developedtechnology for making fire• Latter, they developed.– Chemical energy in wood > heat >comfort of habitatdlitf th idi tand quality of their diet.• Usage and control offiregaveHome erectusadistinctadvantageover other species and contributed in theirsurvival and further progress.• Invention of “Bow and Arrow” some 10 – 15 thousandyears ago is an important technological development –classified as “weapon” or “tool” but “energy converter”is the most accurate technical description.• It allowed humans totransforma small portion ofmuscle energyinto highly controllablekinetic energy –kinetic energydeadly missile.Chapter-1-Pg.4