1907, a British Henry Joseph round discovered that when an electric current is applied to the inorganic materials, it could emit light. Since then, people start the study of the LED. And through the d...
lesley
Aug 13,2020
2317 views
| Ranking | Name | Answers |
|---|---|---|
| 1 | PCBWay Team | 5 |
| 2 | Mason Goebel | 1 |
| 3 | Engineer | 1 |
