The strength of the electric current (amperage) is the amount of electric current that conducts through electrical components, such as cables. The strength of an electric current measures the number of electrons that pass through a certain point in a given period of time, with 1 ampere (or “amp”) equal to 1 coulomb per second. Measuring amperage is very important when you are dealing with electrical circuits, especially to ensure that no wires are overloaded with currents. You can measure electric current with a special tool called a multimeter.
Step
Step 1. Determine the amperage rating of the multimeter
A multimeter is a small device that can be used to measure voltage, resistance, and electric current. Each model has a rating for handling a specific amount of current, and this rating should match the electrical device you wish to measure. For example, if you use a multimeter rated at 10 amperes to measure 200 amperes, the multimeter's axis will be damaged. This amperage rating will be listed on the unit and in the product user manual.
Step 2. Select the appropriate multimeter function
Most multimeters have a function to measure several quantities. To measure electric current, you need to set the function to DC or AC, according to the electrical system under test. The system power source will determine the type of electric current. For example, the power in the household is AC, while the power from the battery is DC.
Step 3. Set the range of your multimeter
To ensure that the axis of your multimeter is not damaged, set the maximum amperage sensitivity above your estimate. You can lower it if the multimeter doesn't read anything when connected to your system.
Step 4. Connect the copper end to the terminal
Your multimeter comes with 2 wires, one with a metal tip and the other with a copper tip. Connect the two wires to the appropriate terminals to measure the electric current of the electrical system. The tool manual will show the correct terminals, if the labels are not clearly visible.
Step 5. Turn on the power grid with a multimeter to measure the current
This step is very dangerous and can cause electric shock if you measure household AC current, or other high-voltage and high-current power sources, or even low-current power sources. Turn off all circuit breaker before working and use the metal end of the AC gauge to see if the AC is completely off before touching the wires, especially the parts that are not wrapped in protective film. Do not work in wet or even slightly damp places because water conducts electricity and can do you harm. Wear rubber gloves. Take other preventive measures. Consult an electrician directly (don't just read articles on the internet) before you start work. Assume that the protective layer of the cable is peeling off due to defects in installation or old age. Cables that are not wrapped in protective coating will cause electric shock. It's a good idea to have someone ready to call an ambulance, in case an accident occurs and you need emergency assistance right away. This person should be trained in first aid and CPR. If you experience an electric shock, this person will need to remove you from the electrical system using a material that does not conduct electricity, such as a dry cloth, to prevent this person from being electrocuted. You should always consult a professional electrician and read user manuals before working (not through articles on the internet) and know the type of current to be encountered. Clamp the wires at one point to the copper on the multimeter. Make sure the exposed parts of the cable don't touch you. Restart the breaker and adjust the sensitivity of the meter if no readings come out.
Step 6. Turn off the circuit breaker and use the metal tip of the AC gauge to make sure the AC is off
Only in this case can you reassemble the power grid. Follow the precautions listed in step 5 and user manuals (and not articles on the internet) just in case. After reading, fix your broken power grid. It's safer to buy and install new cables than to patch the cut areas.
Tips
- Always read the entire user manual for accident prevention measures before using the multimeter.
- Wear rubber gloves when dealing with power lines.
Warning
- Electricity can cause electric shock and even death.
- Do not work in wet or even very humid areas. Water and humidity can conduct electricity and harm you.
- Ask someone to be available with a cell phone. Check mobile power and signal before working. This person should also be trained in first aid and CPR. Don't let this person touch you at work.
- Be careful with your skin and even the material of your clothing as they can conduct electricity.
- Always read electrical manuals (not online articles) before dealing with voltage or current sources (especially large ones).
- Wear thick rubber gloves when working with live power lines.
- Always read the entire user manual for precautions before working with a multimeter.
