In this article, we discuss about How to** Convert Current to Voltage** using Resistor with different examples like 0-20 mA to 0-10 VDC Conversion, 4-20 mA to 2-10 VDC Conversion, 0-20 mA to 0-5 VDC Conversion.

## Convert Current to Voltage

It is extremely simple to measure 0-20ma signal with a device that will measure only Voltage inputs. If Voltage input module available will accept a 0-10Vdc signal, but may not accept a 0-20ma signal directly.

Basically, Ohms law is used to calculate a resistor value in order to convert the 0-20ma signal to a voltage.

## Example : 0-20 mA to 0-10 VDC Conversion

Ohms law states:Â R = V/IÂ whereÂ VÂ is the Voltage,Â IÂ is the current and R is the resistance

RÂ = 10V/0.020A =Â 500 Ohms

V = I*R = 0.020*500 = 10V

## Example : 4-20 mA to 2-10 VDC Conversion

Ohms law states:Â **R = V/I**Â whereÂ **V**Â is the Voltage,Â **I**Â is the current and R is the resistance**Â **

**R**Â = 10V/0.020A =Â 500 Ohms

V = I*R = 0.020*500 = 10V

## Example : 0-20 mA to 0-5 VDC Conversion

Ohms law states:Â **R = V/I**Â whereÂ **V**Â is the Voltage,Â **I**Â is the current and R is the resistance**Â **

**RÂ **= 5V/0.020A =Â 250 Ohms

V = I*R = 0*250Â Â Â Â Â Â Â = 0V

V = I*R = 0.020*250 = 5V

**Note:-**

- To avoid damage you must ensure that the external current source has short-circuit protection in all conductor cases.
- The external resistor is a source of error because of its dependency on temperature and its inaccuracy.
- In order to obtain measuring results that are as precise as possible it is recommended to use resistors with tolerances that are as small as possible.

Credits : myplctechnology blog