Lesson Notes By Weeks and Term v4 - SHS 3

Lesson Video

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Performance objectives

• Explain the importance of energy efficiency in Ghana.
• Describe the methodology for designing energy-efficient devices.
• Identify key factors in energy consumption.
• Analyze an energy-efficient device case study.

Lesson summary

In Ghana, we are all familiar with the challenges of managing our energy resources, from the national issue of "dumsor" to the personal challenge of managing our ECG prepaid credits. Energy is a finite and expensive resource. Therefore, learning how to use it wisely is not just an academic exercise; it is a critical life skill for personal savings, economic stability, and environmental protection. This lesson moves beyond simply "switching off lights" and introduces a systematic engineering approach—a methodology—for creating new devices and systems that actively help us conserve energy.

Lesson notes

A. Foundational Definitions Energy Conservation: This is the act of reducing energy consumption through behavioural changes. It means using less energy. *Example:* Turning off the lights when you leave a room, or taking a shorter shower to save energy used by the water heater. Energy Efficiency: This is the use of technology that requires less energy to perform the same function. It's about getting the same output with less energy input. *Example:* Replacing an old incandescent bulb with a modern LED bulb. Both produce light, but the LED bulb uses up to 80% less electricity. Design Methodology: This is a systematic, step-by-step approach or process that engineers follow to solve a problem. It provides a structured way to move from identifying a need to creating a functional and tested solution. It prevents guesswork and ensures all important factors are considered. B. The Methodology for Designing Energy Conservation Devices

Engineers follow a structured process to ensure their designs are effective, safe, and economical. For energy conservation devices, the methodology can be visualized with the following flowchart and explained in these steps:

Flowchart of the Design Methodology

``` [ 1. Identify Problem & Need ] ↓ [ 2. Define Requirements & Constraints ] ↓ [ 3. Brainstorm & Conceptualize Solutions ] ↓ [ 4. Analyse & Select Best Concept ] ↓ [ 5. Detailed Design & Prototyping ] ↓ [ 6. Test, Evaluate & Gather Data ] ↓ [ 7. Refine & Iterate the Design ] ↓ [ 8. Final Documentation & Implementation ] ```

Evaluation guide

• Explain the methodology for designing devices for energy conservation.
• Initiating Talk for Learning: Use a flowchart to explain the methodology for designing devices for
• conceptual
• understanding