GEOG 3EE3 Lecture Notes - Lecture 5: Compact Fluorescent Lamp, Energy Conversion Efficiency, Combine Harvester
6 Mar 2017
School
Department
Course
Professor
Document Summary
Useful energy -> 10% converted e. g. compact fluorescent light: only 3. 17% of initial 1 gj of coal that was available from a 35 kg mass: expanding uses of energy. Humanity has made several transitions: from hunter-gatherers to settled agriculture; them metallurgy; followed by the trade of coal and the steam engine and expansion of trade and economies. Now have multiple purposes for energy to be used overtime, so we have learned how to use energy sources in different ways. Energy and sectors of the economy classification of human activities helps to understand how energy is used commercial = services *diagram* i. e. printing newspapers, etc. Canada: 1,720. 9 pj in 2013 being used in the form of energy. Medieval times generate food for themselves and trade with others see better tools to work the land, different types of biomass being used (horses = more efficient) also using irrigation which is more efficient for food production.
