L4 Efficiency
Presentation
•
Physics
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9th Grade
•
Medium
L Osborne
Used 1+ times
FREE Resource
34 Slides • 9 Questions
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L4 Efficiency
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Multiple Choice
If we took a light bulb, what type of energy would be useful?
kinetic energy
gravitational potential energy
light energy
thermal energy
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Multiple Choice
From our light bulb, what would be the wasted energy?
chemical energy
thermal energy
light energy
kinetic energy
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Poll
What about a speaker connected to your computer? The useful energy would be
light energy
electrical energy
sound energy
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Multiple Select
In our speaker, the wasted energy would be
electrical energy
sound energy
thermal energy
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Open Ended
If my son left the TV on (again!) and 500J of energy were input (from the power supply). How much energy would be wasted if 300J of useful light energy was output (given out)?
500J total input = 300J useful output (light) + ? J wasted output (thermal)
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Open Ended
If my dog left the light on (again!) and 200J of energy were input (from the power supply). How much energy would be wasted if 125J of useful light energy was output (given out)?
200J total input = 125J useful output (light) + ? J wasted output (thermal)
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Open Ended
Write the equation that links efficiency, useful energy transfer and total energy transfer
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Multiple Choice
If a kettle transfers 170,000J of energy when it is switched on to boil some water and 162,000J is used to actually heat the water, the efficiency of the kettle can be calculated as:
8,000J170,000J = 21.25
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Open Ended
Calculate the % efficiency of a light that uses 2000J to light up of which 500J of energy is used as useful light energy.
(To convert your efficiency calculation to a %, you need to multiply your answer by 100) :)
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You Do - Calculating Efficiency
Answer the next 4 questions into your book - you don't need to write our the questions
Then self assess your answers with a green pen
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L4 Efficiency
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