Topic 4: I can see clearly now

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Topic 4: I can see clearly now

Siemens Education

Restricted © Siemens AG 2013 All rights reserved.

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



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



Into the light



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?



Low energy bulb and filament bulb



Sankey diagram



Sankey diagram for low energy bulb



Sankey diagram for low filament bulb



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%



Parabolic reflector

Topic 4: I can see clearly now

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