Lesson Notes By Weeks and Term v4 - JHS 1
ELECTRICITY AND ELECTRONICS
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ELECTRICITY AND ELECTRONICS
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Science
Class: JHS 1
Term: 2nd Term
Week: 10
Grade code: B7.4.2.2.1
Strand code: 4
Sub-strand code: 2
Content standard code: B7.4.2.2
Indicator code: B7.4.2.2.1
Theme: FORCES AND ENERGY
Subtheme: ELECTRICITY AND ELECTRONICS
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Electricity and electronics are part of everyday life in Ghana—mobile phones, radios, TV sets, torches, traffic lights, phone chargers, and even simple doorbells all work because of electronic components connected correctly in a circuit. In this lesson, learners will identify basic electronic components (LEDs, P–N junction diodes, resistors, capacitors), read key markings (especially resistor colour codes), and assemble a simple electronic circuit safely and correctly. NaCCA Alignment (Indicator B7.4.2.2.1): *Demonstrate how to assemble basic electronic circuits using components such as LEDs, P–N junction diodes, resistors and capacitors.*
2.1 What is an electronic circuit? An electronic circuit is a complete path that allows electric current to flow through components to perform a function (e.g., lighting an LED, sounding a buzzer).
Basic requirements for a working circuit: A power source (battery/cell) Conducting path (wires/breadboard tracks) A load/component (LED, buzzer, resistor, etc.) A complete loop (no break in the path)
2.2 Electronic components in this lesson (A) LED (Light Emitting Diode) An LED is a diode that emits light when current flows through it in the correct direction. Polarity matters: Anode (+): usually the longer leg Cathode (−): usually the shorter leg and the LED body often has a flat side near the cathode
Why we use a resistor with an LED: LEDs can be damaged by too much current. A resistor limits current.