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 **0-20 mA signal** with a device that will measure only Voltage inputs. If the Voltage input module available will accept a **0-10 Vdc** 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: R = V/I where V is the Voltage, I is the current and R is the resistance

R = 10V/0.020A = 500 Ohms

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

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

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

**R** = 10V/0.020A = 500 Ohms

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

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

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

**R **= 5V/0.020A = 250 Ohms

V = I*R = 0*250 = 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

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