411 REFERENCE · Wikibooks
Electronics Handbook/Circuits/Voltage Divider
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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.
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Figure A: Voltage Divider circuit.
Transfer Function of Voltage Divider
Consider the circuit in Figure A.
According to KVL Kirchhoff’s Voltage Law the voltage drops across resistors and .
If a current flows through the two series resistors then by Ohm’s Law
i
So
p
Therefore
v