How does an ammeter measure current? What should be paid attention to when measuring current?

Everyone often uses an ammeter to measure the current of the wire when repairing electrical circuits, so how does the ammeter measure the current? Next, let’s give a brief introduction to Zuchuang Technology.

How does an ammeter measure current?

1. Different types of ammeters have different measurement methods. For example, we connect the pointer ammeter to the line in series, turn on the switch, and read the value pointed to by the pointer of the ammeter. When using a digital clamp ammeter for measurement, we adjust the ammeter's range to the maximum, and the ammeter's pliers clamp the running wire to be measured in the clamp core, and read the ammeter's value.

2. We can also measure the current with a multimeter. We turn the multimeter to the current gear, and then select the measurement range according to the magnitude of the measured current. Next, the plug of the red pen is inserted into the com hole, the plug of the black pen is inserted into the current hole, and the tip of the electric pen is placed on the positive and negative ends of the measured object. Just read the multimeter value.

What should be paid attention to when measuring current?

1. When measuring current, you must first make sure you are measuring AC or DC, and then turn the multimeter to the corresponding gear. If the gear is wrongly selected, the current cannot be measured. When measuring current, we also need to pay attention to the range of the current. Many times, we do not know the current size of the line under test. We can first adjust the range to the maximum value, and then slowly reduce the range. This can avoid the situation that the measuring range is too small, the measured current is large, and the ammeter is burned out.

2. When measuring current, we should connect an ammeter in series with the line. If we connect its ammeter wrongly, in parallel, the ammeter will burn out. Electric current flows from the positive terminal to the negative terminal. When measuring current, do not reverse the positive and negative terminals of the object being measured. Otherwise, the pointer ammeter will not only fail to measure the value correctly, but will also damage the ammeter. The digital ammeter has little impact, and a negative number will appear on the front end of the value.