Water from a reservoir flows to the turbine in a hydroelectric system at a rate of $500\,\text{kg s}^{-1}$. The reservoir lies $300\,\text{m}$ above the turbine level. The electrical output from the generator driven by the turbine is $200\,\text{A}$ at a potential difference of $6000\,\text{V}$. What is the efficiency of the system?
- A$8.0\%$
- B$8.2\%$
- C$80\%$
- D$82\%$