# Ohms Law  - Potential difference = current x [Resistance](Resistance.md)  - $V= IR$  - Ohm's Law applied to the full circuit: Electromotive [Force](Force.md) = current x (sum of the circuit [Resistance](Resistance.md) and the internal [Resistance](Resistance.md) of the cell)  - $EMF = I(R+r)$