- From the definition of potential difference, the electrical work done is given by the equation W=QV
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
Given that the potential difference across a bulb is 240V and the current that flows through the bulb is 0.25A. Find the energy dissipated in the bulb in 30s.
Formula of current,