Aim: To create Sankey Diagrams to describe energy transfers. Keywords: Transformation;Efficiency Definition: Energy transfer: The movement of a single form of energy from place to place or from one body to body. Energy transformation: The change of one form of energy into another form of energy. Focus question: How do we illustrate energy transformations. We can use diagrams like a 'Sankey diagram', this allows us to show how the inputted energy is used. The arrows have different proportions which shows how much energy is going in on and out through that of useful or wasteful energy. The first 'sankey diagram' is of a normal light bulb. it shows that there is 100j going into the bulb, only 75% gets turned into light energy and the other 25% into wasted heat energy. Now if we do the math that means that the light bulb is running on a 75% efficiency rate because 75% of the energy is used for productive purposes. The second sankey diagram is that of an LED(light-emitting diodes). This diagram shows that there is 4j going into the bulb, and this shows that 3.2j or lost to heat energy. Then it shows that 0.8j or transferred into light energy. After doing the math we can see that the LED has an efficiency rate of 20%. So you could argue the question, why are people switching to LED? The answer has many components that sway it both ways but if you have money in your pocket it is a definite yes. This is because the LED's last 25 times as long as normal light bulbs, they also produce less heat energy which puts less stress on air conditioners. The final reason is that it costs a 25th of the cost to run the lights. In today's lesson our teacher taught us how to draw a 'sankey diagram'. Below in the images are my drawings. Lesson Summary:
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AuthorStudent from St Augustine's College in Brookvale, NSW ArchivesCategories![]()
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