Lesson Notes By Weeks and Term v4 - SHS 3
ELECTRONIC COMPONENTS AND CIRCUITS
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ELECTRONIC COMPONENTS AND CIRCUITS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 3
Term: 2nd Term
Week: 18
Grade code: 2.5.2.LI.7
Strand code: 4
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
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This lesson introduces the fundamental building blocks of all digital devices: logic gates. Every smartphone, computer, digital watch, and even the system that controls traffic lights in cities like Accra and Kumasi, operates based on simple decisions made by millions of these tiny electronic switches. By understanding logic gates, we learn the 'language' that digital electronics use to process information. We will explore how these gates work using truth tables and a special kind of algebra called Boolean algebra. This knowledge is essential for anyone interested in electronics, computer science, or engineering.
What are Logic Gates?
In digital electronics, we work with signals that can only have two states: HIGH (represented by the number 1) or LOW (represented by the number 0). HIGH (1): Can mean 'ON', 'True', or 'Voltage Present' (e.g., +5V). LOW (0): Can mean 'OFF', 'False', or 'No Voltage' (e.g., 0V).
A logic gate is an electronic device that takes one or more of these binary inputs (1s and 0s) and produces a single binary output based on a specific logical rule. They are the basic building blocks of any digital system. What is a Truth Table?
A truth table is a chart that shows every possible input combination to a logic gate and the corresponding output for each combination. It is a simple way to describe exactly how a logic gate behaves. What is a Boolean Expression?