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Physics 21: Energy Transfers

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Mr Easby

on 1 December 2016

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Transcript of Physics 21: Energy Transfers

ENERGY TRANSFERS Part of the first law of thermodynamics states:
Energy cannot be created of destroyed, it can only be changed from one form to another.
This is called THE LAW OF CONSERVATION OF ENERGY Starter (worksheet)
Match the energy type with the definition In any closed system, the energy inside it, cannot be increased or decreased. Therefore:
OUTPUT ENERGY = INPUT ENERGY In a torch, the batteries store POTENTIAL CHEMICAL ENERGY. When the torch is switched on, this energy is transferred to ELECTRICAL ENERGY, then transferred into LIGHT ENERGY.
However, because the torch is not EFFICIENT, HEAT ENERGY is also released. Chemical Potential Electrical Light and Heat Complete the energy transfer for the following machines:
Wind-up radio
wind turbine
solar powered calculator
Catapult Sankey diagrams
Sankey diagrams summarise all the energy transfers taking place in a process. The thicker the line or arrow, the greater the amount of energy involved. A Sankey diagram gives a visual illustration of an input/output situation. It is drawn to scale - there are lots of variations as to how they are drawn - only thing they have in common is that the width of the 'arms' represents the energy transferred but the length of the 'arms' does not!
They show not only the energy transfers involved but also the quantitative distribution of values in the transfers. Learning Objectives
1 2 3 Demonstrate an understanding that energy is conserved Describe energy transfer chains Demonstrate an understanding of how diagrams can be used to represent energy transfers Plenary Light Nuclear Gravitational Potential Elastic Potential Heat Sound Chemical Electrical Kinetic ENERGY TRANSFER RELAY In pairs, you must complete as many of the energy transfers as you can in 10 minutes.
When you think you are correct, bring it to the front. If it is correct, you can take the next one.
The winning pair is either the pair who completes all 10 correctly first OR gets the most right in 10 minutes. SANKEY DIAGRAMS
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