# voltage divider rule

**Voltage Division Rule**

· Definition of voltage divider

· Voltage division

· Applications of voltage division

**Voltage divider definition**

**Voltage divider also known as potential divider is a passive linear circuit and is may be defined as a number of electrical resistances connected to a voltage source in series used to obtain a desired fraction of input voltage as output.**

**It comes with taps at certain points to obtain a variable fraction of input voltage as output, frequently used to give power supplies to electronic devices.**

**Voltage division**

**The distribution of input voltage among the different elements of the voltage divider is called**

**.**

*voltage division*
For example, we know

I =V

_{in }/(R_{1}+R_{2})
So, voltage across the first resistor is

V

_{R1}= I R_{1 }= R_{1}V_{in }/ (R_{1}+R_{2})
i.e, V

_{R1 }= V_{in}R1/(R1+R2)
Similarly, voltage across the second resistor would be

V

_{R2 }= V_{in}R2/(R1+R2)
[since, in series circuit current is same in both the resistances]

Therefore, to find the voltage over an individual resistance in series, take the total series voltage and multiply by the individual resistance over the total resistance.

**Applications of voltage divider**

**Voltage dividers are used for scaling of voltage levels, biasing of electronic devices and measurement of voltages. A potentiometer is a most common voltage divider which is used as a variable voltage divider in many radios to control the volume of radios.**

Potentiometer

There are other applications of voltage divider listed below,

· By scaling down high voltages with the help of voltage divider, we can be able to measure high voltages by voltmeter.

· Voltage divider can be used to measure the resistance of sensors using microcontroller.

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