Lesson Notes By Weeks and Term v4 - SHS 1
ANALOGUE ELECTRONICS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
ANALOGUE ELECTRONICS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Physics
Class: SHS 1
Term: 2nd Term
Week: 18
Grade code: 1.3.3.LI.1
Strand code: 3
Sub-strand code: 3
Content standard code: 1.3.3.CS.1
Indicator code: 1.3.3.LI.1
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: ANALOGUE ELECTRONICS
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
Welcome, students! Today, we are diving into the exciting world of analogue electronics. Look around you – at your phones, the traffic lights on the street, the indicator light on the TV, and the rechargeable lamps we use during power outages ("dumsor"). All these things work because of tiny components that control electricity. We will study two of these special components: the Light Emitting Diode (LED), which gives us efficient light, and the Zener Diode, which acts like a security guard for our precious gadgets, protecting them from bad voltage. Understanding how they work is the first step to understanding the technology that powers our modern lives in Ghana.
This lesson is divided into two main parts: The LED and the Zener Diode. Part A: The Light Emitting Diode (LED)
A Light Emitting Diode (LED) is a semiconductor device that emits light when an electric current passes through it. Think of it as a tiny, very efficient light bulb. Unlike a normal bulb with a filament that heats up and glows, an LED produces light through a process called electroluminescence.
Symbol of an LED: The symbol is like a standard diode, but with arrows pointing away from it, indicating that it emits light.
How it works (Simplified): Inside the LED, when current flows, electrons and "holes" (places where electrons are missing) combine. When they combine, they release energy in the form of photons, which are tiny packets of light. The colour of the light (red, green, blue, etc.) depends on the semiconductor material used.