A battery of electromotive force (e.m.f.) 12.0 V and of negligible internal resistance is used in the circuit below.
The current from the battery is 50 mA. The current in the resistor X X\,X is 20 mA. The resistors Y Y\,Y and Z Z\,Z are identical.
What is the power dissipated in the resistor ZZZ?
90 mW90\text{ mW}90 mW
120 mW120\text{ mW}120 mW
180 mW180\text{ mW}180 mW
360 mW360\text{ mW}360 mW