# Electric Resistance

on . Posted in Electrical Engineering Electric 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

$$\large{ R = \frac{V}{I} }$$
Symbol English Metric
$$\large{ R }$$ = resistance $$\large{\Omega}$$ $$\large{\frac{kg-m^2}{s^3-A^2}}$$
$$\large{ V }$$ = voltage $$\large{V}$$ $$\large{\frac{kg-m^2}{s^3-A}}$$
$$\large{ I }$$ = current $$\large{I}$$ $$\large{\frac{C}{s}}$$

## Electric resistance formula

$$\large{ R = \frac{V^2}{P} }$$
Symbol English Metric
$$\large{ R }$$ = resistance $$\large{\Omega}$$ $$\large{\frac{kg-m^2}{s^3-A^2}}$$
$$\large{ V }$$ = voltage $$\large{V}$$ $$\large{\frac{kg-m^2}{s^3-A}}$$
$$\large{ P }$$ = power $$\large{P}$$ $$\large{\frac{kg-m^2}{s^3}}$$

## Electric resistance formula

$$\large{ R = \frac{P}{I^2} }$$
Symbol English Metric
$$\large{ R }$$ = resistance $$\large{\Omega}$$ $$\large{\frac{kg-m^2}{s^3-A^2}}$$
$$\large{ P }$$ = power $$\large{P}$$ $$\large{\frac{kg-m^2}{s^3}}$$
$$\large{ I }$$ = current $$\large{I}$$ $$\large{\frac{C}{s}}$$

### Tags: Electrical Equations