How To Use A Resistor To Measure Current

July 15, 2017

Electric current is measured in amperes but actually in most electronics work youll measure current in milliamps or ma. Dc current measurement using shunt resistor circuit dc current measurement circuit using shunt resistor.

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Shunt Resistor And Reverse Current Electrical Engineering

Figure 1 using a digital multimeter amp.

How to use a resistor to measure current. Using a one ohm resistor to measure current in a circuit under test. How to design amplifier circuit for shunt voltage. Shunt resistor to measure current lets consider this real life scenario we are still interested to measure 30 a and the multimeter that you are using is for example the agilent u1253b 45 digit handheld digital multimeter which has a maximum current rating of 10 a.

Below is diagram showing how to measure current using a shunt resistor. I looked it up and found some links to forums where people are saying that you can use a resistor rather than a dmm to measure current but i cant find anything saying how to do this. How arduino can be used to measure current using shunt resistor.

The largest current you can measure is theoretically limitless provided the voltage drop across the shunt resistor does not exceed the working voltage range of the ammeterdata acquisition board. In this example we are measuring 50amp current using 75mv shunt rsense. Shunt gives 75mv voltage across it when we pass the.

There are many situations where a maker might want to either measure the current in a circuit or use the current in one part of a circuit to control another part. It is extremely simple to measure 0 20 ma signal with a device that will measure only voltage inputs. By measuring the voltage across the resistor the current can easily be calculated.

To measure current you must connect the two leads of the ammeter in the circuit so that the current flows through the ammeter. 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. In other words the ammeter must become a part of the circuit itself.

For example of a 10w resistor is placed in circuit and a reading of 100 mv is detected across it then using ohms law it can be deduced that the current is v r 01 10 10 ma. This video goes through the steps of setting up a digital multi meter and the measurement of resistance voltage and current. This is an example of how a 005 ohm precision resistor can be used to measure calculate ac or dc current and power produced from your bicycle pedal power generator.

If the voltage input module available will accept a 0 10. Let us begin with one of the simplest tricks known to most electronics experimenters. Sometimes in videos made by the youtube creator electroboom the creator says he is using a 1 ohm series resistor to measure current.

Using this approach the current is not actually directed into the ammeterdata acquisition board but instead through an external shunt resistor. Convert current to voltage.