Joule: Difference between revisions
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<onlyinclude>A '''joule''' is the [[SI]] base unit for [[energy]]. It is equal to < | [[Category:Translated to French]] | ||
[[fr:joule]] | |||
[[Category:Translated to Spanish]] | |||
[[es:Julio]] | |||
<onlyinclude>A '''joule''' is the [[SI]] base unit for [[energy]]. It is equal to <math>1 \frac{kg\cdot m^2}{s^2}</math>.<ref>APS Physics. (2015). Energy Units [Online]. Available: http://www.aps.org/policy/reports/popa-reports/energy/units.cfm [February 20, 2015].</ref></onlyinclude> In physical terms, lifting an apple one [[meter]] takes 1 joule of energy. This should not be confused with a [[watt]] which is a [[units|unit]] of [[power]] and a rate of how fast energy is used. | |||
While the joule is the [[SI]] base unit for energy, when speaking in real-world terms, we often use the [[kilowatt-hour]] ( | While the joule is the [[SI]] base unit for energy, when speaking in real-world terms, we often use the [[kilowatt-hour]] (kWh) instead. This is due to the fact that a joule is an extremely small amount of energy. To put how small a joule is into perspective, a [[liter]] of [[gasoline]] has 31,536,000 joules of energy in it. Using a single 100 W incandescent light bulb for ten hours (0.1 kW x 10 hrs = 1 kWh) would take 3,600,000 joules. Human activities take many joules of energy! | ||
[[File:pitching.jpg|800px|center|thumb|Figure 1. A 250 g baseball traveling at 20 m/s (72 kph) has 50 joules of kinetic energy.<ref>Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/2/25/Baseball_pitching_motion_2004.jpg</ref>]] | |||
==Conversions== | ==Conversions== | ||
<html><br /> <iframe src=" | <html><br /> <iframe src="https://energyeducation.ca/simulations/converter/converter.php?defaultMeasure=Energy&defaultFrom=joule&defaultTo=calorie (thermochemical)" scrolling="no" width="750" height="280"> </iframe><br /> </html> | ||
To read more about the Joule, click [http://www.unc.edu/~rowlett/units/dictJ.html#joule here] | To read more about the Joule, click [http://www.unc.edu/~rowlett/units/dictJ.html#joule here] | ||
==For Further Reading== | |||
*[[Energy]] | |||
*[[End use energy]] | |||
*[[Primary energy]] | |||
*[[Energy conversion technology]] | |||
*Or explore a [[Special:Random|random page]] | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
[[Category:Uploaded]] | [[Category:Uploaded]] | ||
Latest revision as of 20:12, 10 July 2023
A joule is the SI base unit for energy. It is equal to .[1] In physical terms, lifting an apple one meter takes 1 joule of energy. This should not be confused with a watt which is a unit of power and a rate of how fast energy is used.
While the joule is the SI base unit for energy, when speaking in real-world terms, we often use the kilowatt-hour (kWh) instead. This is due to the fact that a joule is an extremely small amount of energy. To put how small a joule is into perspective, a liter of gasoline has 31,536,000 joules of energy in it. Using a single 100 W incandescent light bulb for ten hours (0.1 kW x 10 hrs = 1 kWh) would take 3,600,000 joules. Human activities take many joules of energy!
Figure 1. A 250 g baseball traveling at 20 m/s (72 kph) has 50 joules of kinetic energy.[2]
Conversions
To read more about the Joule, click here
For Further Reading
References
- ↑ APS Physics. (2015). Energy Units [Online]. Available: http://www.aps.org/policy/reports/popa-reports/energy/units.cfm [February 20, 2015].
- ↑ Wikimedia Commons [Online], Available: https://upload.wikimedia.org/wikipedia/commons/2/25/Baseball_pitching_motion_2004.jpg
