Ohm: Difference between revisions
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[[File:Carbon_Resistor.gif|framed|right|Figure 1. A carbon resistor with the resistance of 2 MΩ, the [http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/rescarb.html#c2 colour code] gives the resistance in Ohms.<ref name=R1>Hyperphysics. (August 28, 2015). ''Carbon Resistors'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/rescarb.html</ref>]] | [[File:Carbon_Resistor.gif|framed|right|Figure 1. A carbon resistor with the resistance of 2 MΩ, the [http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/rescarb.html#c2 colour code] gives the resistance in Ohms.<ref name=R1>Hyperphysics. (August 28, 2015). ''Carbon Resistors'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/rescarb.html</ref>]] | ||
<onlyinclude>The '''Ohm''' (Ω) is a [[units|unit]] of electrical [[resistance]], | <onlyinclude>The '''Ohm''' (Ω) is a [[units|unit]] of electrical [[resistance]], measured in [[volt]]s/[[ampere]], to quantify the resistance in [[resistor]]s, [[conductor]]s, or even [[electrical insulator]]s.</onlyinclude>.<ref>Hyperphysics. (August 28, 2015). ''Ohm's Law'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/ohmlaw.html</ref> | ||
Measurements of resistance go from 0 Ω for [[superconductor]]s to ~< | Measurements of resistance go from 0 Ω for [[superconductor]]s to ~<math>10^{-6} \Omega </math> for a [[centimeter|cm]] block of metal like [[copper]] or [[aluminum]] and up to ~<math> 10^{19} \Omega </math> for a block of [[sulfur]].<ref>Hyperphysics. (August 28, 2015). ''Table of Resistivity'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/rstiv.html#c1</ref><ref>PeriodicTable. (August 28, 2015). ''Technical data for the element sulfur'' [Online], Available: http://www.periodictable.com/Elements/016/data.html</ref> Very few physical measurements have spanned 25 orders of magnitude like this (for length, that's a ratio of the [[size of the universe|thickness of a fingernail to the size of a galaxy]])! | ||
To learn more about the Ohm please see Dr. Rowlett's [http://www.unc.edu/~rowlett/units/dictO.html#ohm dictionary of units]. | To learn more about the Ohm please see Dr. Rowlett's [http://www.unc.edu/~rowlett/units/dictO.html#ohm dictionary of units]. | ||
Latest revision as of 22:53, 18 May 2018
Figure 1. A carbon resistor with the resistance of 2 MΩ, the colour code gives the resistance in Ohms.[1]
The Ohm (Ω) is a unit of electrical resistance, measured in volts/ampere, to quantify the resistance in resistors, conductors, or even electrical insulators..[2]
Measurements of resistance go from 0 Ω for superconductors to ~ for a cm block of metal like copper or aluminum and up to ~ for a block of sulfur.[3][4] Very few physical measurements have spanned 25 orders of magnitude like this (for length, that's a ratio of the thickness of a fingernail to the size of a galaxy)!
To learn more about the Ohm please see Dr. Rowlett's dictionary of units.
References
- ↑ Hyperphysics. (August 28, 2015). Carbon Resistors [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/rescarb.html
- ↑ Hyperphysics. (August 28, 2015). Ohm's Law [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/ohmlaw.html
- ↑ Hyperphysics. (August 28, 2015). Table of Resistivity [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/rstiv.html#c1
- ↑ PeriodicTable. (August 28, 2015). Technical data for the element sulfur [Online], Available: http://www.periodictable.com/Elements/016/data.html