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.4
Strand code: 4
Sub-strand code: 1
Content standard code: 2.4.1.CS.1
Indicator code: 2.4.1.LI.4
Theme: ELECTRICAL AND ELECTRONIC TECHNOLOGY
Subtheme: ELECTRICAL SYSTEMS DESIGN
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This lesson focuses on Direct Current (DC) generators, which are essential machines that convert mechanical energy into DC electrical energy. In Ghana, we experience the need for reliable power every day. From the batteries that power our phones and flashlights ('torchlights') to the complex electrical systems in cars and solar power installations that provide light during power outages ('dumsor'), DC power is all around us. Understanding how a DC generator works is a fundamental skill for any student of Applied Technology, opening up opportunities in automotive repair, renewable energy, and industrial maintenance.
A. Principle of Operation
The operation of a DC generator is based on a fundamental principle in physics known as Faraday's Law of Electromagnetic Induction. Faraday's Law states: Whenever a conductor cuts across magnetic lines of force (magnetic flux), an electromotive force (EMF) or voltage is induced in that conductor.
For this to happen, three conditions must be met: A magnetic field (produced by magnets or electromagnets). A conductor (usually a coil of wire). Relative motion between the magnetic field and the conductor (one must be moving relative to the other).
The magnitude of the induced EMF depends on: The strength of the magnetic field. The speed of the relative motion. The length of the conductor within the field. The number of turns in the conductor coil.