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6.1 Energy (6.1.1 Energy Changes in a System, and the Ways Energy is…
6.1 Energy
6.1.1 Energy Changes in a System, and the Ways Energy is Stored Before and After Such Changes
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6.1.1.4 Power
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"YOU'RE A UNIT OF POWER, HARRY!" "I'm a Watt?"
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Summary:
The concept of energy emerged in the 19th century. The idea was used to explain the work output of steam engines and then generalised to understand other heat engines. It also became a key tool for understanding chemical reactions and biological systems. Limits to the use of fossil fuels and global warming are critical problems for this century. Physicists and engineers are working hard to identify ways to reduce our energy usage.