Lesson Notes By Weeks and Term v4 - SHS 2
ELECTRONIC COMPONENTS AND CIRCUITS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
ELECTRONIC COMPONENTS AND CIRCUITS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 2
Term: 2nd Term
Week: 18
Grade code: 2.5.2.LI.7
Strand code: 5
Sub-strand code: 2
Content standard code: 2.5.2.CS.1
Indicator code: 2.5.2.LI.7
Theme: ELECTRICAL AND ELECTRONIC TECHNOLOGY
Subtheme: ELECTRONIC COMPONENTS AND CIRCUITS
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
Transistors are the single most important invention in modern electronics. They are the tiny switches and amplifiers that power everything from our mobile phones and radios to computers and traffic lights. In Ghana, a deep understanding of transistors is essential for anyone interested in repairing electronic gadgets, a common and valuable skill in our communities. By learning how to test, identify, and use transistors, you are gaining the foundational knowledge to build, troubleshoot, and design circuits that can solve real-world problems. This lesson will move from the basic theory of what a transistor is to the practical skills of testing them and applying them in simple circuits.
2.1 What is a Transistor?
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is the fundamental building block of modern electronic devices.
Think of a transistor like a water tap or valve (`kanea` in Twi). The Base (B) is the handle of the tap. The Collector (C) is the main pipe bringing water from the tank. The Emitter (E) is the outlet where the water flows out.
A small effort to turn the handle (a small base current, `Ib`) controls a large flow of water from the pipe (a large collector current, `Ic`). If you don't turn the handle at all (`Ib = 0`), no water flows (`Ic = 0`).