From 00:22

In the customization of the transformer, the test is particularly important.

From 00:26

The test of DC resistance mainly includes FIVE tests.

From 00:40

The higher the copper content of the copper wire the smaller the resistance value of the wire itself.

From 00:49

if the resistance value of the copper wire is too high, it means that the copper content is insufficient.

From 00:56

During operation, the copper loss increases and the temperature rises, which will directly affect the life of the transformer.

From 01:04

So we must control the copper content of the wire.

From 01:12

These four are copper wires of the same length with different cross-sectional areas.

From 01:54

Under the same length, the resistance value of the copper wire is inversely proportional to its cross-sectional area.

From 02:02

If the cross-sectional area changes, its resistance value also changes.

From 02:07

Therefore, an effective way to control the DC resistance value is to control the wire diameter of the wire.