Lesson Notes By Weeks and Term v4 - SHS 1
ANALOGUE ELECTRONICS
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ANALOGUE ELECTRONICS
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Subject: Physics
Class: SHS 1
Term: 2nd Term
Week: 15
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
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Welcome, students! Today, we are diving into a fascinating part of physics that is all around us: Analogue Electronics. Look at the small light on the television that shows it has power, the screen of your phone, or the traffic lights on our streets. These are often made of Light Emitting Diodes (LEDs). Also, have you ever wondered how your phone charger takes the fluctuating power from the wall socket and gives your phone a steady, safe voltage? This is often achieved with components like the Zener Diode. Understanding these two simple components is key to understanding how modern electronics work.
This lesson is in two parts. First, we will look at the LED, and second, we will study 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 flows through it in the forward direction. It is a special type of diode.
Circuit Symbol: It's important to know the symbol. It looks like a normal diode, but with two arrows pointing away from it, signifying that it emits light.
``` Anode (+) --->|--- Cathode (-) | / \ / \ ^ ^ | | (Arrows indicating light) ```