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Understanding Energy Efficiency Through Light Bulbs and Sankey Diagrams

This educational resource focuses on analyzing different light bulb technologies, specifically low energy and filament bulbs, through data gathering and the construction of Sankey diagrams. Students will learn how these bulbs transfer energy, evaluate their societal impacts, and engage in cost-benefit analyses of various solutions. Additionally, they'll design their own floodlight reflector using principles of reflection. The activity aims to deepen understanding of energy efficiency and the importance of technology in everyday life.

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Understanding Energy Efficiency Through Light Bulbs and Sankey Diagrams

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  1. Siemens Education Topic 4: I can see clearly now

  2. I can see clearly now • Overall learning objectives: • To gather and use data to construct Sankey diagrams to illustrate efficiencies and support conclusions • To explain how light bulbs can transfer energy and the concepts behind different light bulb technologies, and to use ideas about reflection to design flood light reflector • To evaluate the impact of different technologies on society and different technological approaches to a challenge • To conduct cost benefit analysis and evaluate different solutions using set criteria

  3. I can see clearly now • Overall learning outcomes: • Students will have analysed two different sorts of bulb in terms of how they work and how energy efficient they are • Student will have used ideas about reflectors to design and test one of their own to meet a particular brief • Students will have decided how to apply multiple success criteria

  4. I can see clearly now • Into the light

  5. I can see clearly now • Into the light • Why did the installation of lighting transform the area? • Why did low energy lighting make it more cost effective? • What is special about low energy lights?

  6. I can see clearly now • Low energy bulb and filament bulb

  7. I can see clearly now • Sankey diagram

  8. I can see clearly now • Sankey diagram for low energy bulb

  9. I can see clearly now • Sankey diagram for low filament bulb

  10. I can see clearly now • Efficiency • Note that efficiency indicates how much of the energy transferred to the device is transferred out of it usefully • Efficiency = useful output • total input • Efficiency for low energy bulb = 75/100 = 75% • Efficiency for filament bulb = 10/100 – 10%

  11. I can see clearly now • Parabolic reflector

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