In this photo we see three voltmeters (across the top) and five ammeters (across the bottom) attached to a voltage divider connected to a load.

30 V is applied then 2 mA flows through R₁ and then splits with 1 mA going through R₂ and 1 mA going through R_load. 20 V drops across R₁ and there is 10 V across R₂ and R_load.

The circuit on the left in the schematic below is the one being tested. In this case R₁, R₂, and R_load are all 10 kΩ. As R₂ and R_load are connected in parallel their effective resistance is 5 kΩ. R₁ being 10 kΩ gets two thirds of the voltage because R₂ || R_load is 5 kΩ getting one third of the 30 V being 10 V.