Electronics

Syllabus tag: KCSE | Physics | Form 4 | Topic 40 Electronics

Lesson objectives

By the end of this topic, you should be able to:

• Distinguish conductors, insulators and semiconductors.
• Explain intrinsic and extrinsic semiconductors and doping.
• Describe the p-n junction diode and its use in rectification.
• Describe the transistor and its use in switching and amplification.

Summary

Semiconductors have conductivity between that of conductors and insulators, and it increases with temperature. Doping produces n-type (extra electrons) and p-type (holes) material. A p-n junction diode conducts in one direction only, which allows rectification. A transistor switches and amplifies.