Electrical Energy

Electrical Energy

  1. 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
  1. 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 flows through the bulb is 0.25A. Find the energy dissipated in the bulb in 30s.

Answer:
Formula of current,
I= Q/t
hence
Q=It

Energy dissipated,