Lesson Notes By Weeks and Term v4 - JHS 3
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 3
Term: 2nd Term
Week: 10
Grade code: B9.4.2.1.1
Strand code: 4
Sub-strand code: 2
Content standard code: B9.4.2.1
Indicator code: B9.4.2.1.1
Theme: FORCES AND ENERGY
Subtheme: ELECTRICITY AND ELECTRONICS
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Electricity is part of everyday life in Ghana—lighting homes, charging phones, powering fans, TVs, welding machines, water pumps and school ICT labs. In all these uses, electrical energy is transformed into other forms of energy such as light, heat, sound and motion. Understanding how this transformation happens in series and parallel circuits, and how voltage (V), current (I) and resistance (R) relate, helps learners to predict bulb brightness, prevent overloading, and troubleshoot simple electrical problems safely.
A. Electrical Energy Transformation (What it means) Electrical energy transformation is when electrical energy changes into other forms of energy when current flows through a device.
Common transformations: Bulb (filament or small torch bulb): electrical → light + heat Electric iron/kettle/heater: electrical → heat Fan/motor: electrical → motion (kinetic) + sound + heat Radio/speaker: electrical → sound Phone charging: electrical → chemical energy stored in battery (plus some heat)
Important idea: Energy is not “created”; it is converted from one form to another.
B. Circuit Basics A circuit is a complete path that allows current to flow from the positive terminal of a cell/battery through components and back to the negative terminal.