The voltage divider rule is a fundamental circuit principle stating that the voltage across one resistor in a series string equals the total voltage multiplied by the ratio of that resistance to the total resistance. Engineers use this math constantly to scale down signals, set bias points, or measure high voltages safely.
Heard on the job
Just use the VDR to pick the feedback resistors for a 3.3 volt output.
Also heard as
- voltage divider rule
- voltage division rule
Related terms
Voltage divider
A simple passive circuit that scales down an input voltage to a lower, predictable output level.
Resistor
A passive two-terminal component used to limit current flow, divide voltages, or terminate transmission lines.
In series
A circuit configuration where components are connected end-to-end so the same current flows through all of them.