In the series circuit shown below, the potential difference across the light-emitting diode (LED) is 2.4 V2.4\text{ V}2.4 V when it is emitting light.
The current in the circuit is 80 mA80\text{ mA}80 mA. What is the value of the resistor RRR?
120 Ω120\,\Omega120Ω
100 Ω100\,\Omega100Ω
140 Ω140\,\Omega140Ω
130 Ω130\,\Omega130Ω