Joules, Watts, And Horsepower
Published on Nov 24, 2015
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PRESENTATION OUTLINE
JOULE
- the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour.
- The word joule comes from joule, james Prescott
- The joule was discovered when james Prescott figured out the law of conservation of energy then this led to the development of the first law of thermodynamics
WATT
- The SI derived unit used to measure power, equal to one joule per second. In electricity, a watt is equal to current (in amperes) multiplied by voltage (in volts).
- The word watt comes from james watt
- James Watt was a Scottish inventor and mechanical engineer whose improvements to the Newcomen steam engine were fundamental to the changes brought by the Industrial Revolution
HORSEPOWER
- a foot-pound-second unit of power, equivalent to 550 foot-pounds per second, or 745.7 watts.
- The orgin and the history of horsepower comes from 1806, from horse + power, established by Watt as the power needed to lift 33,000 pounds one foot in one minute, which is actually about 1.5 times the power of a strong horse.
- The term horsepower comes from james watt
HOW WE USE JOULES
- We use joules all the time, we use them to lift objects, push objects, and throw objects
- One joule is enough to lift one small Apple in the air
HOW WE USE WATTS
- Watts are very helpful they help power steam engines
- Watts also provide power for a lightbulb so we can have light
HOW WE USE HORSEPOWER
- Horsepower helps power cars, lawn mowers, and etc
- One horsepower is the power needed to move 550 pounds (249kg) one foot in one second. 3. A car's gearing can make a high-revving engine put down a lot of effective torque to the ground. If the gearbox and differential reduce crank RPM to wheel RPM by 9 times, you also get 9 times the torque at the wheels.
