Voltage Divider


This voltage divider produces an output voltage, Vo, that is proportional to the input voltage, Vs. The output voltage is measured using a voltmeter. The input voltage is the voltage of the voltage source. The constant of proportionality is called the gain of the voltage divider. The value of the gain of the voltage divider is determined by the resistances, R1 and R2, of the two resistors that comprise the voltage divider.



The gain, g, of the voltage divider is given by

so

The design equations

and

show how to select values of R1 and R2 to achieve a specified value of gain.