Lesson Notes By Weeks and Term v4 - SHS 3
ELECTRONIC COMPONENTS AND CIRCUITS
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ELECTRONIC COMPONENTS AND CIRCUITS
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Subject: Applied Technology
Class: SHS 3
Term: 2nd Term
Week: 19
Grade code: 2.5.2.LI.9
Strand code: 4
Sub-strand code: 2
Content standard code: 2.5.2.CS.1
Indicator code: 2.5.2.LI.9
Theme: ELECTRICAL AND ELECTRONIC TECHNOLOGY
Subtheme: ELECTRONIC COMPONENTS AND CIRCUITS
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Welcome, future engineers and technicians! Today, we are diving into the brain of every digital device you use—from your mobile phone and television to the traffic lights in our cities and the prepaid meters in our homes. These devices work by making millions of simple "yes/no" decisions every second. The electronic components that make these decisions are called Logic Gates. In this lesson, we will learn what these gates are, how they work, and most importantly, how to combine them to create circuits that perform useful tasks. Understanding logic gates is the first step to designing, building, and troubleshooting any digital electronic system.
A. Introduction to Digital Logic
In the digital world, everything is represented by two states: ON or OFF. We use numbers to represent these states: 1 represents HIGH (or ON, True, +5V) 0 represents LOW (or OFF, False, 0V)
Logic Gates are electronic circuits that take one or more of these binary inputs (0s and 1s) and produce a single binary output based on a specific logical rule. B. Basic Logic Gates
These are the fundamental building blocks. The AND Gate Function: The output is HIGH (1) only if ALL its inputs are HIGH (1). Analogy: Think of two switches connected in series to a light bulb. The bulb will only light up if Switch A AND Switch B are both closed (ON). Symbol: Boolean Expression: `Q = A . B` (Read as "Q equals A AND B") Truth Table: A table showing all possible input combinations and their corresponding outputs.