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How To Measure Amps On 240v Circuit With Multimeter? [Updated Guide]

By shafiq usama

how to measure amps on 240v circuit with multimeter

As an electrical engineer, I love explaining how things like circuits and electronics work. I write on my blog to share simple explanations, reviews, and useful tips about the latest technology.

A multimeter and knowledge of voltage, current, and resistance are all you need to measure amps in 240V circuits. A multimeter measures voltages and currents in circuits.Using a multimeter is one of the most important tools for anyone who needs to test and diagnose electrical circuits. If you know how to measure amps on 240v circuit with multimeter then take a short guid.

Quick Guide

The multimeter should be set to measure current (amps) and the range should be high, usually higher than expected. Disconnect one wire from the circuit and turn off the power. Place the probes in line with the circuit and connect the multimeter in series. Check the multimeter’s display for current by turning on the power

Understanding a Multimeter and Its Functions

A multimeter is an electronic device that measures various electrical values in circuits. It can measure voltage, current (amps), and resistance in an electrical circuit. Amps (amperage) measure the amount of current flowing through the circuit. 

Multimeter and Its Functions

By placing the leads of a multimeter on two points of a circuit, you can measure how much amperage is present in that portion of the circuit. Most multimeters have a rotary switch or multiple buttons that allow you to select the measurement type you want. To learn more about how to check Short Circuits without a multimeter then, click here

Safety Precautions for Testing an Electrical Circuit

Safety Precautions for Testing an Electrical Circuit

Before measuring amps on a 240v circuit with a multimeter, it’s important to observe safety precautions. Since electricity is involved, there is always the risk of electric shock or injury. Therefore, it’s essential to take proper precautions when testing electrical circuits.

Here are some tips to ensure your safety:

• Make sure the power is off before taking any measurements.

• Wear protective equipment, such as insulated gloves and safety glasses.

• Use a circuit tester to verify the power is off before touching any wires or components.

• Do not touch exposed wires or terminals with bare hands.

• Don’t place the multimeter leads on conductive surfaces, which can cause inaccurate readings.

• Be sure to use a high-quality, properly calibrated multimeter.

How To Measure amps On 240v Circuit With Multimeter? 4 Steps

Step#1 Determine the type of current

There are two types of electric current: Alternating Current (AC) and Direct Current (DC).

The type of electric current running through your circuit determines the current setting for your multimeter. In the United States, AC current is likely to run in your circuit.

Step#2 Multimeter Setup: 

Switch the multimeter to the current measurement mode (amps). Disconnect one wire from the load you’re testing, and turn off the circuit power. Ensure that the multimeter leads are plugged into the correct sockets; the “A” or “mA” sockets are usually used for measuring current.

Step#3 Circuit Connection: 

How To Measure Amps On 240v Circuit With Multimeter

Connect the circuit by placing the multimeter in series. Make sure that one lead of the multimeter is connected to the circuit’s power source, and the other lead is connected to the load or appliance.

Step#3 Reading Amps: 

Connect the circuit power once the connections are secure. A multimeter will display the current flowing through a circuit. Make a note of the reading. An accurate measurement will be obtained if the current falls within the multimeter’s range.

Step#4 Interpreting Results: 

How To Measure Amps On 240v Circuit With Multimeter

Don’t exceed the multimeter’s current range to avoid damaging the device. On a 240V circuit, make sure your multimeter is rated for the current you’re measuring. For complex or high-voltage measurements, you should also consult a professional electrician. Now you know how to measure amps on 240v circuit with multimeter but if you encounter something then take troubleshooting tips.

Taking Accurate Readings of the Current in the Circuit

Once you have established a connection between both leads and the circuit, you can begin to take measurements. When measuring amps on a 240v circuit, paying attention to any current fluctuations is important. 

If you experience any sudden changes, it could be an indication of a problem with the circuit. When taking readings, it’s best to take several measurements over time to ensure accuracy. This will allow you to diagnose any issues in the circuit accurately.

Diagnosing Circuit Issues from Measurements Taken

Once you have taken multiple readings of current in a circuit, you can use them to diagnose any issues in the circuit. If you find that the current is higher than expected, it could indicate a problem with the wiring or components of the circuit. 

Once you have taken the necessary measurements, you can compare them to a known value for accuracy and begin diagnosing any potential issues with the circuit. For example, if the current measurement is too high or low compared to the expected value, this could indicate a problem, such as a loose connection or a fault in the wiring.

Troubleshooting Common Electrical Faults Using A Multimeter

Troubleshooting common electrical faults using a multimeter can be a straightforward and effective way to diagnose the issue. By measuring the current in a circuit, you can determine if any components are faulty or not functioning properly. 

Here are some tips for troubleshooting common electrical faults with a multimeter:

Check the wiring: Ensure all wires are securely connected and not damaged.

• Measure resistances: When measuring the current in a circuit, check the resistance to ensure it’s within an acceptable range.

Test continuity: Use the multimeter to test for continuity between two circuit points.

Check voltage: Measure the voltage to make sure it’s within a safe range.

Test fuses: Use the multimeter to check for continuity in fuses and breakers.

Test switches: Test each switch in a circuit to ensure it functions properly.

By following the steps outlined above, you can take accurate readings of the current in a circuit and diagnose any potential issues from the measurements taken. With a basic understanding of using a multimeter, you can troubleshoot common electrical problems quickly and easily. 


Measuring amps on a 240v circuit with a multimeter is a relatively straightforward process. It should be done carefully if you take the necessary safety precautions and follow the steps outlined in this article.

It is essential to exercise caution when dealing with any live electrical circuit. Always ensure the power supply is turned off and stay away from water or wet surfaces when testing an electrical circuit. Also, use insulated gloves and tools when handling any exposed wires. Now you can tell the other people about how to measure amps on 240v circuit with multimeter.