Ohm's Law

In the provided circuit diagram, there are three resistors, R1, R2, and R3, with resistances of 10 kΩ, 2 kΩ, and 1 kΩ respectively, and they are all connected to a 9V battery. You are asked to identify which resistor uses the most energy and to calculate what portion of the total power that resistor accounts for.

Which resistor uses the most energy?