Electric Resistance

on . Posted in Electrical Engineering

pie chartElectric resistance 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
\( R \) = electric resistance \(\Omega\) \(kg-m^2\;/\;s^3-A^2\)
\( V \) = electric voltage \(V\) \(kg-m^2\;/\;s^3-A\)
\( I \) = electric current \(I\) \(C\;/\;s\)

 

Electric resistance formula

\(  R =  V^2 \;/\; P \)     (Electric Resistance)

\(  V = \sqrt{ R \; P } \)

\(\  P =  V^2 \;/\; R \)

Symbol English Metric
\( R \) = electric resistance \(\Omega\) \(kg-m^2\;/\;s^3-A^2\)
\( V \) = electric voltage \(V\) \(kg-m^2\;/\;s^3-A\)
\( P \) = electric 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
\( R \) = electric resistance \(\Omega\) \(kg-m^2\;/\;s^3-A^2\)
\( P \) = electric power \(P\) \(kg-m^2\;/\;s^3\)
\( I \) = electric current \(I\) \(C\;/\;s\)

 

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Tags: Electrical