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Voltage Divider Calculator

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

Volts
Ohms
Ohms
Volts

Table of Contents:

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    Formula

    Vout = [ Rb / (Ra+Rb) ] * Vin

    Where,
    Vin = Input Voltage
    Vout = 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.
    Vin: 25 Volts
    Ra: = 15 Ohms
    Rb = 20 Ohms

    Solution:
    Apply Formula:
    Vout = [ Rb / (Ra+Rb) ] * Vin
    Vout = [20/(15+20)]*25
    Vout = [20/35]*25
    Vout = 0.571*25
    Vout = 14.2857 Volts