Lesson Notes By Weeks and Term v4 - SHS 3
ELECTROMAGNETIC INDUCTION & APPLICATIONS
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ELECTROMAGNETIC INDUCTION & APPLICATIONS
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Subject: Physics
Class: SHS 3
Term: 2nd Term
Week: 11
Grade code: 3.3.3.LI.3
Strand code: 3
Sub-strand code: 3
Content standard code: 3.3.3.CS.1
Indicator code: 3.3.3.LI.3
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: ELECTROMAGNETIC INDUCTION & APPLICATIONS
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This lesson explores the core principles of how electricity is generated from magnetism, a process called electromagnetic induction. We will investigate the factors that determine how much electromotive force (e.m.f.) or voltage is produced and learn a simple rule to predict the direction of the resulting electric current. This knowledge is fundamental to understanding how the electricity that powers our homes, schools, and industries is generated, from the giant hydroelectric turbines at the Akosombo Dam to the small backup generators we use during power outages ('dumsor').
Starter (5 mins): Recall Activity Let's quickly recall what we know. What happens when an electric current flows through a wire? (Expected answer: It produces a magnetic field around it). This is the principle behind electromagnets and electric motors (using Fleming's Left-Hand Rule).
Today, we ask the reverse question: Can a magnetic field produce an electric current? The answer is YES, and the process is called Electromagnetic Induction. Part A: Electromagnetic Induction and Induced E.M.F.
Definition: Electromagnetic Induction is the process of producing an electromotive force (e.m.f.) across an electrical conductor in a changing magnetic field. This e.m.f. is called the induced e.m.f., and if the conductor is part of a closed circuit, an induced current will flow.
This discovery was made by Michael Faraday. He found that you can induce a current in a coil of wire in two main ways: Move a magnet near the coil. Move the coil near a magnet. Change the magnetic field strength near the coil (e.g., by changing the current in a nearby electromagnet).