Lesson Notes By Weeks and Term v4 - SHS 2
ELECTRONIC COMPONENTS AND CIRCUITS
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ELECTRONIC COMPONENTS AND CIRCUITS
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Subject: Applied Technology
Class: SHS 2
Term: 2nd Term
Week: 17
Grade code: 2.5.2.LI.6
Strand code: 5
Sub-strand code: 2
Content standard code: 2.5.2.CS.1
Indicator code: 2.5.2.LI.6
Theme: ELECTRICAL AND ELECTRONIC TECHNOLOGY
Subtheme: ELECTRONIC COMPONENTS AND CIRCUITS
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Welcome, learners! Today, we are exploring one of the most important inventions of the 20th century: the transistor. Think about your mobile phone, the radio in your home, the decoder for your television ("Multi-TV"), or even the solar charge controller some of you use during "dumsor". All these devices rely on millions or even billions of tiny electronic switches and amplifiers called transistors. Understanding how they work is the key to understanding all modern electronics. They are the building blocks that make our digital world possible. In this lesson, we will uncover the magic behind these tiny but powerful components.
What is a Transistor?
A transistor is a semiconductor device used to amplify electronic signals or to act as a fast-acting electronic switch.
Think of a transistor like a water tap (valve). The water flowing from the main pipe to your bucket is the main electric current. The small effort you use to turn the tap handle is the control signal. A small turn of the handle can control a large flow of water. Similarly, a small electrical signal (current or voltage) applied to one part of a transistor can control a much larger electrical current flowing through its other parts.
There are three main families of transistors we will study: Bipolar Junction Transistors (BJT) Field Effect Transistors (FET) Unijunction Transistors (UJT)