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Dec 19, 2012 4:00:00 AM

How to Convert mA to Voltage

Amps Ohms Volts GaugeA common question we get is how to convert mA to voltage.

First, let's start with terminology:

  • 1 mA = 0.001 AMP (short for amperes)
  • Amps are referred to as CURRENT
  • Resistor values are in OHMS (Ω is the symbol for ohms)
  • VOLTAGE is the result of passing amps through a resistor

 

 In order to change mA (current) to voltage, you need to pass the current through a resistor.

The formula for voltage is: E = IR, where E = volts, I = amps, and R = resistance.

In control circuits, the most common resistor values are 250Ω & 500Ω although any value can be used depending upon the device.

If your control circuit is using a 250Ω resistor:
mA Amps x Resistance Volts
4 0.004 x 250Ω 1
5 0.005 x 250Ω 1.25
6 0.006 x 250Ω 1.5
7 0.007 x 250Ω 1.75
8 0.008 x 250Ω 2.0
9 0.009 x 250Ω 2.25
10 0.010 x 250Ω 2.5
11 0.011 x 250Ω 2.75
12 0.012 x 250Ω 3.0
13 0.013 x 250Ω 3.25
14 0.014 x 250Ω 3.5
15 0.015 x 250Ω 3.75
16 0.016 x 250Ω 4
17 0.017 x 250Ω 4.25
18 0.018 X 250Ω 4.5
19 0.019 x 250Ω 4.75
20 0.020 x 250Ω 5
If your control circuit is using a 500Ω resistor:
mA Amps x Resistance Volts
4 0.004 x 500Ω 2
5 0.005 x 500Ω 2.5
6 0.006 x 500Ω 3
7 0.007 x 500Ω 3.5
8 0.008 x 500Ω 4
9 0.009 x 500Ω 4.5
10 0.010 x 500Ω 5
11 0.011 x 500Ω 5.5
12 0.012 x 500Ω 6
13 0.013 x 500Ω 6.5
14 0.014 x 500Ω 7
15 0.015 x 500Ω 7.5
16 0.016 x 500Ω 8
17 0.017 x 500Ω 8.5
18 0.018 x 500Ω 9
19 0.019 X 500Ω 9.5
20 0.020 x 500Ω 10

 

Need help converting something else?  Visit our metric conversion chart. Trust us, it's super helpful.

Please add your comments below, or contact us directly for more information.

 

 

Topics: General Industrial OEM, Critical Environments, Process/Mfg Tank Level, HVAC/R OEM, Water and Wastewater, Industrial Vacuum, Test and Measurement, Building Automation, Barometric, Medical, OHV, Calibration, General Industrial, Alternative Fuels, Oil and Gas, Scales, HVAC/R, Semiconductor Manufacturing

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