The diagram shows a cell with electromotive force (e.m.f.) $3.0\,\text{V}$ and internal resistance $4.7\,\Omega$ connected across a lamp. The lamp has a resistance of $9.3\,\Omega$. What is the power dissipated by the internal resistance of the cell?
- A$0.22\,\text{W}$
- B$0.43\,\text{W}$
- C$0.64\,\text{W}$
- D$1.0\,\text{W}$