### Electrical Energy

- From the definition of potential difference, the electrical work done is given by the equation
$$W=QV$$
Where

W = work

Q = charge

V = potential difference

- Since the work done must be equal to the energy to do the work, therefore we can also say that, the electrical energy ( E ) is also given by the formula $$E=QV$$

**Example**

Given that the potential difference across a bulb is 240V and the current that flow through the bulb is 0.25A. Find the energy dissipated in the bulb in 30s.

**Answer**:

Formula of current,

$$I=\frac{Q}{t}$$ hence

$$Q=It$$

Energy dissipated,

$$\begin{array}{l}E=QV\\ E=(It)V\\ E=(0.25)(30)(240)\\ E=1800J\end{array}$$