Electronics Handbook/Circuits/Voltage Divider

Voltage Divider edit

If two circuit elements are in series, there is a voltage drop across each element, but the current through both must be the same. The voltage at any point in the chain divides according to the resistances. A simple circuit with two (or more) resistors in series with a source is called a voltage divider.


Figure A: Voltage Divider circuit.

Transfer Function of Voltage Divider edit

Consider the circuit in Figure A. According to KVL the voltage   is dropped across resistors   and  . If a current i flows through the two series resistors then by Ohm's Law.