apr18 - What is energy? Work Application of force through...

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What is energy? Work – Application of force through ad distance. Joule – Amount of work done when a force of 1 Newton is exerted over 1 meter. Power – Rate at which work is done. Watt – One joule per second Energy – The capacity to do work. Kilowatt-hour – 1000 watts used for 1 hr. Calorie – Amount of energy necessary to heat 1 gram of water 1-degree C. Fire probably first human energy technology. Muscle power provided by domestic animals has been important since dawn of agriculture 10,000 years ago. Wind and water power used nearly as long. Coal replaced wood at beginning of 19 th century. Oil replaced coal in 20 th century. Current Energy Sources Fossil fuels currently provide about 86% of all commercial energy in the world. Hydroelectric dams supply about 7% of commercial power. Nuclear power makes up about 7% of commercial power. Per Capita Consumption Richest countries have consumed nearly 80% of all commercial energy. This is changing. On average, each person in the U.S. and Canada uses more than 300 GJ of energy
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apr18 - What is energy? Work Application of force through...

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