# Power

## 1 megawatt = 1,000,000 watts

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## Scottish engineer James Watt to compared the output of steam engines with the power of draft horses. 18th cent

draft horse: a large horse bred to be a working animal doing hard tasks such as plowing and other farm labor. (Wikipedia)

## Horsepower = 746 W

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## Examples of engines doing work

### http://www.animatedengines.com/

http://giphy.com/search/mechanical-engineering

## Work is related to a change in potential energy

http://www.physicslessons.com/xlab-powerrun.html

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## Learning Standards

Massachusetts Science and Technology/Engineering Curriculum Framework

2. Conservation of Energy and Momentum
2.3 Describe both qualitatively and quantitatively how work can be expressed as a change in mechanical energy.
2.4 Describe both qualitatively and quantitatively the concept of power as work done per unit time.

SAT Physics Subject Test Learning Standards

Mechanics: Energy and momentum, such as potential and kinetic energy, work, power, impulse, and conservation laws