# Potential Divider - Online Calculator

## Output voltage from a potential divider

A potential divider is the simplest way of producing a source of lower e.m.f. from a source of higher e.m.f.

The output voltage from a potential divider can be calculated as

U_{out}= U_{in }R_{2 }/ (R_{1}+ R_{2}) (1)

where

U_{out}= output voltage (V)

R = resistance (Ohms, Ω)

U_{in}= input voltage (V)

### Example - Potential Divider

The output voltage from a potential divider with two resistors *R _{1} = 10 ohms* and

*R*and input voltage

_{2}= 20 ohms*12 V*can be calculated as

* U _{out} = (12 V) (20 Ω) / ((10 Ω) + (20 Ω)) *

* = 8 (V)*

The current through the potential divider *R _{1}* and

*R*(ex. output current) can be calculated by using Ohm's law

_{2}*I = U / R*

* = (12 V) / ((10 Ω) + (20 Ω))*

* = 0.4 A*

The power cocumption of the divider can be calculated

*P = U I *

* = (12 V) (0.4 A)*

* = 4.8 W*

### Potential Divider - Calculator

* input voltage (volts)*

* resistor R _{1} (ohm)*

* resistor R _{2} (ohm)*

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