### Relationship Between Current and Potential Difference

### Ohm’s Law

- The relationship between the current passing through 2 points in a conductor and the potential difference between the 2 points is given by Ohm's law.
- Ohm’s Law states that the current flowing in the metallic conductor is directly proportional to the potential difference applied across it’s ends, provided that the physical conditions ( such as temperature ) are constant. $$I\alpha V$$ or $$V=kI$$ where k is a constant

**Example**:

What is the current flow through an 800Ω toaster when it is operating on 240V?

**Answer**:

Resistance, R = 800Ω

Potential difference, V = 240V

Current, I = ?

$$\begin{array}{l}R=\frac{V}{I}\\ I=\frac{V}{R}=\frac{240}{800}=0.3A\end{array}$$