A charge of $0.40\,\text{C}$ flows through a resistor in $1.0\,\text{s}$. Over $2.0\,\text{s}$, the resistor produces $20\,\text{J}$ of thermal energy. What is the potential difference across the resistor?
- A$0.020\,\text{V}$
- B$0.040\,\text{V}$
- C$25\,\text{V}$
- D$50\,\text{V}$