A battery of electromotive force (e.m.f.) 15.0 V and of negligible internal resistance is used in the circuit below.
The current from the battery is 80 mA. The current in the resistor P P\,P is 20 mA. The resistors QQQ, RRR, and S S\,S are identical.
What is the power dissipated in the resistor RRR?
100 mW100\text{ mW}100 mW
300 mW300\text{ mW}300 mW
400 mW400\text{ mW}400 mW
900 mW900\text{ mW}900 mW