Electric Resistance

Written by Jerry Ratzlaff on . Posted in Electrical Engineering

pie chartResistance \((R)\) is the ability to resist or prevent the flow of current. 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 \(\Omega\).            

Ohm is a unit of resistance. A constant current of one ampere produces a force of one volt.

 

Resistance (Ohm) formulas

\(\large{ Ohms = \frac{Volts}{Amps} = R = \frac{V}{I} }\)   
\(\large{ Ohms = \frac{Volts^2}{Watts} = R = \frac{V^2}{P} }\)   
\(\large{ Ohms = \frac{Watts}{Amps^2} = R = \frac{P}{I^2} }\)  

Where:

 Units English Metric
\(\large{ R }\) = resistance \(\large{\Omega}\) \(\large{\frac{kg-m^2}{s^3-A^2}}\)
\(\large{ I }\) = current \(\large{\frac{V}{R}}\) \(\large{W}\)
\(\large{ P }\) = power \(\large{\frac{lbf-ft}{sec}}\) \(\large{R}\)
\(\large{ V }\) = volt \(\large{I\;R}\) \(\large{V}\)

 

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Tags: Electrical Equations