Lesson Notes By Weeks and Term v4 - SHS 2
ELECTROMAGNETISM
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ELECTROMAGNETISM
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Subject: Physics
Class: SHS 2
Term: 2nd Term
Week: 12
Grade code: 2.3.2.LI.3
Strand code: 3
Sub-strand code: 2
Content standard code: 2.3.2.CS.2
Indicator code: 2.3.2.LI.3
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: ELECTROMAGNETISM
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Welcome, students! Today, we are exploring a fascinating principle that powers much of our modern world: electromagnetism. Have you ever wondered what makes an electric fan spin, a blender crush tomatoes for stew, or the corn mill (`kɔnkomotɛ`) in our community grind maize into flour? The answer lies in the magic of turning electricity into motion, a principle at the heart of the electric motor. We will investigate how this works and also learn about the delicate instrument used to detect the very electricity that drives these motors—the moving coil galvanometer. Understanding these devices is key to understanding the technology that makes our lives easier every single day in Ghana.
Part 1: The Direct Current (DC) Motor
A. The Underlying Principle: The Motor Effect The operation of an electric motor is based on a simple but powerful principle called the motor effect.
> The Motor Effect: A conductor carrying an electric current placed in a magnetic field will experience a force. This force causes the conductor to move, if it is free to do so.
The direction of this force is not random; it can be predicted using a rule called Fleming's Left-Hand Rule.