Resistance (Electrical)

Written by Jerry Ratzlaff. Posted in Electrical

pie chartResistance 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.

FORMULA

\(Ohms = \frac{Volts}{Amps}\;\; = \;\;R = \frac{V}{I}\)

\(Ohms = \frac{Volts^2}{Watts}\;\; = \;\;R = \frac{V^2}{P}\)

\(Ohms = \frac{Watts}{Amps^2}\;\; = \;\;R = \frac{P}{I^2}\)

TYPICAL COPPER WIRE RESISTANCE

For stranded copper conductors at 60°F