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: 8
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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Welcome, future engineers and technicians! Today, we are exploring a device that is all around us, powering everything from the small rechargeable fan that cools you during 'dumsor' to the starter motor that cranks your father’s car engine. We are talking about the Direct Current (DC) Motor. Understanding how these motors work is a fundamental skill in applied technology, opening doors to careers in automotive engineering, robotics, and electronics repair. This lesson will demystify the DC motor, showing you the magic of how we turn electricity into useful motion.
2.1 Definition of a DC Motor
A Direct Current (DC) 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 DC source (e.g., a battery, a DC power supply). Output: Mechanical energy (a rotating shaft that can do work).
Think of it as the opposite of a DC generator, which converts mechanical energy into DC electrical energy. 2.2 Principle of Operation
The operation of a DC motor is based on a simple principle of electromagnetism: