In this article, we discuss about How to Convert Voltage to Current using Resistor with different examples like 0-10 VDC to 0-20 mA Conversion, 0-5 VDC to 0-20 mA Conversion.
Convert Voltage to Current
It is extremely simple to measure 0-10Vdc signal with a device that will measure only Current inputs. If Current input module available will accept a 0-20mA signal, but may not accept a 0-10Vdc signal directly.
Basically, Ohms law is used to calculate a resistor value in order to convert the 0-10Vdc signal to a current.
Example : 0-10 VDC to 0-20 mA Conversion
Ohms law states: R = V/I where V is the Voltage, I is the current and R is the resistanceÂ
RÂ = 10V/0.020A =Â 500 Ohms
Example : 0-5 VDC to 0-20 mA Conversion
Ohms law states: R = V/I where V is the Voltage, I is the current and R is the resistanceÂ
RÂ = 5V/0.020A =Â 250 Ohms
I= V/R = 5/250 = 0.02A = 20mA
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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You didn’t consider the internal resistance of the input.