Resistance is a term that students come across often when they study about electric currents. While electric current has two factors namely conductance and resistance we will have a quick look at the latter here in this page. Talking about resistance, it is basically defined as the obstruction that a substance causes to the flow of electric current. Resistance is represented by the letter R and has the dimension length squared mass per time cubed electric current squared. Below we will look at the unit of resistance and other details.
SI Unit of Resistance
The SI unit of resistance is ohm, which is defined as a volt per ampere. The name has been kept in remembrance of German physicist George Simon Ohm. The unit is sometimes written out as a word or symbolised by the uppercase Greek letter omega. Ohm has the following formula;
in which the following units also appear: ampere (A), siemens (S), volt (V), watt (W), second (s), metre (m), joule (J), farad (F), kilogram (kg), and coulomb (C).
There is something called specific resistance or resistivity which is measured by the unit ohm-metre or ohm-m.
Popular Resistance Units
Some of the popular units of resistance include Abohm, megohm, statohm, preece, and planck-impedance. Check out the conversion below.
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Conversion to ohm |
|
|
Abohm |
1 x 10-9 ohm |
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Statohms |
898,755,178,740 ohms |
|
Preece |
1 x 10-6 ohms |
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Megaohm |
1000000 ohm |
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