Ohm's law was discovered and named by Ohm. It is never easy to discover a new knowledge field and draw universal laws from it.

The discovery of ohm's law is also the result of scientists' painstaking efforts, constant attempts and constant changes.

Like many great inventions, ohm was never realized to be widely circulated and used, and went through a difficult period.

Because Ohm had no special education at that time, even though he made such great achievements and published articles, people at that time did not realize that it was not easy to obtain every invention. We should make up our minds to learn from the experience of our predecessors.