Linked from
The 16 pages that link to Voltage divider, each with the reason it gives.
Ohm's lawBroader topic: Its output follows from Ohm’s law applied to series resistances.
VoltageBroader topic: It uses component ratios to create a desired voltage from a supply.
ResistorBroader topic: Two resistors can divide an input voltage in a predictable ratio.
VoltBroader topic: It demonstrates how component values determine a practical voltage.
Kirchhoff's voltage lawBroader topic: Its resistor drops sum to the source voltage by the loop rule.