How to measure the current of a charger with a multimeter?
When measuring current, I prefer to use a clamp multimeter first. For this kind of multimeter, after setting it to the current range, you can simply clip the wire into the circular ring. However, it should be noted that the wire clipped in must be a single wire. If it is single-phase electricity, you can clip either the live wire L or the neutral wire N, but you cannot clip both wires into the circular ring at the same time. The wires of the live wire L and the neutral wire N of the charger are glued together. To measure the current, you need to separate the wires first. In order not to damage the original rubber insulation, you can connect two wires at the plug end and then connect a plug at the other end of the wires. That will do.
For measurement with other ordinary multimeters, the wires on the charger's plug still need to be connected. Just cut one of the live wire or the neutral wire, and connect the two cut ends to the red and black test leads respectively. When measuring the current, set the multimeter to the current range, then power on the circuit and read the value. This method is what is often said that when using a multimeter to measure current, it needs to be connected in series to the circuit. That's how it works.
The statement "measuring the current of a charger with a multimeter" is not rigorous. The maximum output current marked on the charger is a parameter in the production and design.
If it is said "measuring the charging current of a charger with a multimeter", it should be done under the condition of having a load. Disconnect either the positive wire or the negative wire, and then connect the multimeter set to the DC current range in series at the broken wire position for measurement.
When using a multimeter to measure DC electricity, the wiring principle is: let the current flow in from the red test lead and flow out from the black test lead; connect in series when measuring current and connect across when measuring voltage.
There are two ways to measure the current of a charger with a multimeter. One is to measure the AC current at the input end. Disconnect one of the two wires at the input end, either the live wire L or the neutral wire N. Set the multimeter's range to the AC current range, and gradually decrease the range from a high range to avoid burning out the multimeter due to a low range until the accurate current value is measured. The method for measuring the DC output is the same, except that the multimeter's range should be set to the DC range. I wonder if this explanation is clear enough?
