A resistor dissipates $25\,\text{W}$ of power when the potential difference (p.d.) across it is $4.0\,\text{V}$. What is the resistance of this resistor?
- A$0.16\,\Omega$
- B$0.64\,\Omega$
- C$100\,\Omega$
- D$400\,\Omega$
Physics 9702 · AS & A Level · Potential difference and power