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The Voltage Divider refers to a device consisting of a resistor or series of resistors connected across a source of voltage and having one or more fixed or adjustable intermediate contacts where from any two terminals a desired reduced voltage may be obtained. A voltage / potential divider is a simple linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin) mainly used in physics. Generally, Vout is used as a reference voltage. Voltage divider is also called as potential divider.

Voltage Divider Calculator

Table of Contents:

Formula

**V _{out} = [ R_{b} / (R_{a}+R_{b}) ] * V_{in}**

**Where,**

V_{in} = Input Voltage

V_{out} = Output / Reference Voltage

Ra, Rb = Resistances

Voltage divider referenced to ground is created by connecting two electrical impedances in series. Voltage dividers are used for adjusting the level of a signal, for bias of active devices in amplifiers, and for measurement of voltages. A Wheatstone bridge and a multimeter both include voltage dividers. A potentiometer is used as a variable voltage divider in the volume control of a radio.

**Example:**

Calculate the voltage divider circuits for the given details.

V_{in}: 25 Volts

R_{a}: = 15 Ohms

R_{b} = 20 Ohms

**Solution:**

**Apply Formula:**

V_{out} = [ R_{b / (Ra+Rb) ] * Vin
Vout = [20/(15+20)]*25
Vout = [20/35]*25
Vout = 0.571*25
Vout = 14.2857 Volts}