Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Identify good and faulty transistors through testing.
• Explain the principles and operation of transistors.
• Design and simulate basic amplifier circuits.
• Demonstrate care in handling tools and equipment.

Lesson summary

Welcome, future engineers and technicians! Today, we are exploring one of the most important electronic components ever invented: the transistor. Think about your mobile phone, the radio in your home, or the powerful sound systems (PA systems) used in our churches, mosques, and at community events. What gives them the power to make a small voice or a quiet signal loud and clear? The answer is the transistor, working inside an amplifier circuit. In this lesson, we will move from theory to practice. We will learn how to identify and test transistors to see if they are good or faulty, and then we will apply this knowledge to understand and design simple amplifier circuits.

Lesson notes

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 electronics. Think of it as a tiny, electronically controlled valve.

It is made from silicon and has three layers, giving it three terminals: Base (B): The terminal that controls the transistor. A small current here controls a much larger current flowing through the other two terminals. Collector (C): The terminal where the main, large current flows *into*. Emitter (E): The terminal where the main, large current flows *out of*.

Analogy: The Water Tap Imagine a water tap (faucet). The handle you turn is the Base. It takes very little effort to turn it. The pipe bringing water to the tap is the Collector. This is the main source. The spout where water comes out is the Emitter. A small turn of the handle (Base) can control a large flow of water from the Collector to the Emitter. This is amplification! You can also turn the handle to be completely on or completely off. This is switching! 2.2 Types of Bipolar Junction Transistors (BJTs)

Evaluation guide

• Apply the principles and operation of transistors in designing circuits
• Experiential Learning: Engage learners using a mixed ability grouping to:
• Select good transistors from faulty ones by testing and exhibit honesty in identifying
• good transistors from faulty ones.