## The Potential Divider

A potential divider allows an output voltage to be adjusted, to a set level.
It consists of two resistors
$R_1, \: R_2$
in parallel, with an out taken from contacts across
$V_2$
.

The output voltage is
$V_{OUT}=\frac{R_2}{R_1+R_2} \times V_{IN}$
.
The voltage is split across
$R_1, \: R_2$
in the ratio
$R_1 : R_2$
. One of the resistors can be a variable resistor, then
$V_{OUT}$
can be adjusted by turning a knob. Such a device is called a potentometer.