Lesson Notes By Weeks and Term v4 - SHS 3
ELECTRICAL SYSTEMS DESIGN
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ELECTRICAL SYSTEMS DESIGN
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Subject: Applied Technology
Class: SHS 3
Term: 2nd Term
Week: 7
Grade code: 2.4.1.LI.2
Strand code: 4
Sub-strand code: 1
Content standard code: 2.4.1.CS.1
Indicator code: 2.4.1.LI.2
Theme: ELECTRICAL AND ELECTRONIC TECHNOLOGY
Subtheme: ELECTRICAL SYSTEMS DESIGN
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This lesson introduces the Direct Current (DC) motor, a fundamental component in countless devices we use daily. From the starter motor that cranks a tro-tro's engine to the blender in our kitchen for grinding pepper, DC motors are all around us. Understanding how they are built and how they work is a key skill for any student of technology, opening doors to careers in electrical engineering, automotive repair, and electronics. This lesson will demystify the DC motor, breaking down its parts, principles, and practical uses in our Ghanaian context.
Definition of a DC Motor
A DC Motor (Direct Current Motor) is an electrical machine that converts direct current (DC) electrical energy into mechanical energy, usually in the form of rotation. Input: Electrical Energy (from a battery, solar panel, or DC power supply). Output: Mechanical Energy (a spinning shaft that can do work, like turning a fan blade or a wheel).
Think of a rechargeable fan. You charge it with electricity from the wall (which is converted to DC and stored in the battery). When you switch it on, the DC motor uses that stored electrical energy to turn the fan blades, creating a cooling breeze (mechanical energy). Principle of Operation: The Magic of Magnetism and Current
The operation of a DC motor is based on a simple principle in physics: When a conductor carrying an electric current is placed in a magnetic field, it experiences a mechanical force.