A transformer working at an efficiency of $100\%$ has a primary voltage input of $600\,\text{V}$ and a secondary voltage output of $240\,\text{V}$. A resistor with resistance $120\,\Omega$ is connected to the secondary coil. What is the power dissipated in the resistor and what is the current in the primary coil?
- Apower $=120\,\text{W}$, current $=0.20\,\text{A}$
- Bpower $=120\,\text{W}$, current $=5.0\,\text{A}$
- Cpower $=480\,\text{W}$, current $=0.80\,\text{A}$
- Dpower $=480\,\text{W}$, current $=1.3\,\text{A}$