# Electric Resistance

Written by Jerry Ratzlaff on . Posted in Electrical Engineering

Resistance $$\:(R)\:$$ 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.

## Electric 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:

$$\large{ R }$$ = resistance

$$\large{ V }$$ = volt

$$\large{ I }$$ = current

$$\large{ P }$$ = power