Energy Efficiency in Devices
1.
What energy store do the following
have:
a)
Battery
b) Stretched rubber band
c) A uranium nucleus
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Efficiency
Energy
Power
Joules
Watts
Percentage
Recall
what efficiency is.
Recall
the equation for efficiency.
Calculate
efficiencies of various devices.
The more energy something wastes,
the less efficient it is.
Energy is dissipated to the thermal
energy store of the surroundings.
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Stretch:
Name three
different ways
transferring energy.
Complete the
task!
Efficiency is a measure of how good a device is at
changing energy from one form to another.
Efficiency
can be calculated using the formula:
Efficiency =
Useful energy out
x 100%
Total energy in
Stretch:
A car uses a
total of 2,000 J of
chemical energy and
turns it into 1,500 J of
useful kinetic energy.
What is its efficiency?
Note
: You can also see this equation as
Efficiency =
Useful power out
x 100%
Total power in
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Complete the worksheet
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Exam question so exam
conditions!
You have 8 minutes.
Energy efficiency is a crucial concept in understanding how well devices convert energy from one form to another. This summary covers the basics of energy stores, calculation of efficiency, and ways to improve efficiency in devices. Explore the different types of energy stores such as batteries, stretched rubber bands, and uranium nuclei. Learn how to calculate efficiency using the provided formulas and examples. Dive into tasks and worksheets to test your understanding and find answers to various levels of questions.
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Presentation Transcript
SciDoc Efficiency Efficiency 1. What energy store do the following have: a) Battery b) Stretched rubber band c) A uranium nucleus Last Lesson Last Term Last Year Stretch & Challenge I do We do Test I do We do You do Do Now
SciDoc Keywords Learning Objectives Keywords Efficiency Energy Power Joules Watts Percentage Recall what efficiency is. Recall the equation for efficiency. Calculate efficiencies of various devices. I do We do Test I do We do You do Do Now
SciDoc System System The more energy something wastes, the less efficient it is. Stretch: Name three different ways transferring energy. Energy is dissipated to the thermal energy store of the surroundings. I do We do Test I do We do You do LO:
SciDoc Complete the task! I do We do Test I do We do You do LO:
Efficiency is a measure of how good a device is at changing energy from one form to another. Efficiency can be calculated using the formula: SciDoc Stretch: A car uses a total of 2,000 J of chemical energy and turns it into 1,500 J of useful kinetic energy. What is its efficiency? Efficiency = Useful energy out x 100% Total energy in Note: You can also see this equation as Efficiency = Useful power out x 100% Total power in I do We do Test I do We do You do LO:
SciDoc Worksheet Worksheet Complete the worksheet I do We do Test I do We do You do LO:
SciDoc Basic answers Basic answers I do We do Test I do We do You do LO:
SciDoc Medium answers Medium answers I do We do Test I do We do You do LO:
SciDoc Medium answers Medium answers I do We do Test I do We do You do LO:
SciDoc Hard answers Hard answers I do We do Test I do We do You do LO:
SciDoc Hard answers Hard answers I do We do Test I do We do You do LO:
SciDoc Hard answers Hard answers I do We do Test I do We do You do LO:
SciDoc Struggle time Struggle time Exam question so exam conditions! You have 8 minutes. I do We do Test I do We do You do LO:
SciDoc I do We do Test I do We do You do LO:
SciDoc I do We do Test I do We do You do LO:
