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| [[Image:Supercapacitors chart.svg|thumb|right|350px|Ragone chart showing [[energy density]] vs. [[power density]] for various energy-storing devices]]
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| The '''Ragone Chart''' (also called '''Ragone plot''') is a chart used for performance comparison of various energy storing devices. On such a [[chart]] the values of [[energy density]] (in [[Watt-hour|Wh]]/[[kg]]) are plotted versus [[power density]] (in W/kg). Both axes are [[logarithmic scale|logarithmic]], which allows comparing performance of very different devices (for example extremely high, and extremely low power).
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| The Ragone (pronounced "ra-GOH-nee"<ref>http://books.nap.edu/openbook.php?record_id=11065&page=81</ref>) chart was first used to compare performance of [[electric battery|batteries]]. However, it is suitable to compare any energy-storing devices, as is shown in the graph on the right. The chart is named after [[David V. Ragone]].<ref>[http://papers.sae.org/680453 "Review of Battery Systems for Electrically Powered Vehicles"], D. V. Ragone, SAE paper 680453, 1968.</ref>
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| Conceptually, the vertical axis describes how much [[energy]] is available, while the horizontal axis shows how quickly that energy can be delivered, otherwise known as [[Power (physics)|power]], per unit mass. For example, powering a small light-bulb may require low amounts of power, but the power should be delivered slowly enough to operate a [[flashlight]] for minutes or hours of use. Conversely, a high speed [[transistor|electronic switch]] inside a [[computer]] may require very little energy to activate; yet it must be delivered rapidly enough to complete the transaction in mere [[microsecond]]s. These two types of loads would be represented at opposite corners of the '''Ragone chart'''.
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| :Energy Density<math> {= {{V \times I \times t} \over {m}}}</math>
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| :Power density<math> {= {{V \times I} \over {m}}}</math>
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| where ''V'' is [[voltage]](V), ''I'' [[electric current]](A), ''t'' [[time]](s) and ''m'' [[mass]](kg).
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| ==References==
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| {{Reflist}}
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| {{Refimprove|date=August 2008}}
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| {{Commonscat|Ragone plot}}
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| {{DEFAULTSORT:Ragone Chart}}
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| [[Category:Capacitors]]
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| [[Category:Battery (electricity)]]
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| [[Category:Charts]]
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| {{electric-power-stub}}
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Latest revision as of 22:10, 25 June 2014
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