Lesson Notes By Weeks and Term v4 - SHS 2
DIGITAL ELECTRONICS
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DIGITAL ELECTRONICS
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Subject: Physics
Class: SHS 2
Term: 2nd Term
Week: 15
Grade code: 2.3.3.LI.2
Strand code: 3
Sub-strand code: 3
Content standard code: 2.3.3.CS.2
Indicator code: 2.3.3.LI.2
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: DIGITAL ELECTRONICS
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This lesson introduces the fundamental building blocks of all modern digital devices: logic gates. From the smartphone in your pocket used for Mobile Money (MoMo) transactions to the traffic lights in Accra or Kumasi, and the computers we use for learning, everything runs on the principles of digital electronics. Logic gates are simple electronic circuits that make decisions based on logical rules.
2.1 Introduction to Digital Signals (Binary)
In the real world, things can have many values (analogue). For example, the temperature can be 28°C, 28.1°C, 28.15°C, and so on.
Digital electronics, however, works with only two distinct states. This is called binary. We represent one state as HIGH or 1 (e.g., a voltage of +5V is present). We represent the other state as LOW or 0 (e.g., a voltage of 0V is present).
Think of it like a simple light switch: it is either ON (1) or OFF (0). There is no in-between. All digital devices, including phones and computers, process information using millions of these tiny electronic "switches." 2.2 What is a Logic Gate?