Electric Resistance

Electric resistance, abbreviated as R, is a measure of how much an object or substance opposes the flow of electric current through it.  In order to overcome the resistance and get the current to flow a higher voltage will be required. Resistance is measured in Ohms, represented by \(R\) and has a symbols \(\Omega\).  The resistance of an object depends on its size, shape, material, and temperature.

The resistance of a material can be calculated using Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage across it, and inversely proportional to its resistance.

 

Electric resistance formula
\(  R \;=\; V \;/\; I \)     (Electric Resistance) \(  V \;=\; R \; I \) \(  I \;=\; V \;/\; R \)
Symbol	English	Metric
\( R \) = Resistance	\(\Omega\)	\(kg-m^2\;/\;s^3-A^2\)
\( V \) = Voltage	\(V\)	\(kg-m^2\;/\;s^3-A\)
\( I \) = Current	\(I\)	\(C\;/\;s\)

 

Electric resistance formula
\(  R \;=\; V^2 \;/\; P \)     (Electric Resistance) \(  V \;=\; \sqrt{ R \; P } \) \(\  P \;=\; V^2 \;/\; R \)
Symbol	English	Metric
\( R \) = Resistance	\(\Omega\)	\(kg-m^2\;/\;s^3-A^2\)
\( V \) = Voltage	\(V\)	\(kg-m^2\;/\;s^3-A\)
\( P \) = Power	\(P\)	\(kg-m^2\;/\;s^3\)

 

Electric resistance formula
\( R \;=\; P \;/\; I^2 \)     (Electric Resistance) \(  P \;=\; I^2 \; R \) \(  I \;=\; \sqrt{  P \;/\; R }  \)
Symbol	English	Metric
\( R \) = Resistance	\(\Omega\)	\(kg-m^2\;/\;s^3-A^2\)
\( P \) = Power	\(P\)	\(kg-m^2\;/\;s^3\)
\( I \) = Current	\(I\)	\(C\;/\;s\)