Lesson Notes By Weeks and Term v4 - SHS 2

DIGITAL ELECTRONICS

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  2. Lesson Notes By Weeks and Term v4
  3. SHS 2
  4. DIGITAL ELECTRONICS

Subject: Physics

Class: SHS 2

Term: 2nd Term

Week: 15

Grade code: 2.3.3.LI.3

Strand code: 3

Sub-strand code: 3

Content standard code: 2.3.3.CS.1

Indicator code: 2.3.3.LI.3

Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS

Subtheme: DIGITAL ELECTRONICS

Lesson Video

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Performance objectives

Lesson summary

This lesson introduces the 7-segment display, a fundamental component in digital electronics. We see these displays everywhere in Ghana – from the digital clocks on our phones, to the price displays at GOIL and Shell fuel stations, the scoreboards at the Baba Yara Stadium, and even the digital meters for ECG prepaid electricity. Understanding how they work is a key step into the world of digital systems. We will explore the structure of these displays, how to control them, and how they use a simple on/off logic to show us numbers and letters.

Lesson notes

A. What is a 7-Segment Display?

A 7-segment display is an electronic device used to display decimal numerals and a limited set of letters. It is called "7-segment" because it consists of seven main rectangular Light Emitting Diodes (LEDs) arranged in a figure-of-eight pattern. An eighth LED is often included for the decimal point (dp).

Structure and Segment Labels: The seven segments are universally labelled with lowercase letters from 'a' to 'g'.

``` ---a--- | | f b | | ---g--- | | e c | | ---d--- . dp ``` Segment 'a': Top horizontal bar Segment 'b': Top right vertical bar Segment 'c': Bottom right vertical bar Segment 'd': Bottom horizontal bar Segment 'e': Bottom left vertical bar Segment 'f': Top left vertical bar Segment 'g': Middle horizontal bar dp: Decimal Point

Evaluation guide