Energy Circus
Device
Energy Transfer
An electric toaster transfers ___________ energy to _____ energy, _______ energy, _________ energy and _______________ ____________ energy.
A light bulb transfers ____________ energy to _______ energy and _________ energy.
Speakers transfer __________ energy to _______ energy.
A hair dryer transfers ___________ energy to _______ energy, _______ energy and __________ energy
A microwave oven transfers __________ energy to ___________ energy, _______ energy and _________ energy.
A vacuum cleaner transfers ____________ energy to _________ energy, _______ energy and ________ energy
A speed boat transfers _________ energy to _________ energy, ______ energy and _______ energy
A Bunsen burner transfers ___________ energy to _________ energy and ________ energy.
A burning match transfers _________ energy to ________ energy and ________ energy.
A solar cell transfers __________ energy to __________ energy
A catapult transfers __________ energy to ___________ energy.
Lifting a heavy mass transfers ___________ energy to __________ energy and _____________ _____________ energy.
A trampoline transfers __________ energy to __________ energy and _______________ ______________ energy
A runner running transfers ___________ energy to _________ energy, _________ energy and _________ energy.
An iron transfers ___________ energy to ________ energy and ________ energy.
Research the efficiency of devices. Find an equation that allows you to calculate
the efficiency of the device in your investigation:
Efficiency = x 100
Why can’t the efficiency of a device ever be 100%?
Research “energy efficient light bulbs”. Why are they described as more
efficient?
What would the environmental and financial benefits of an “energy efficient”
car be?
Task
Michelle, the manager of a local DIY store has heard about your investigations and has suggested that you could use your knowledge about efficiency to help describe how household devices change energy from one form to another.
Investigate the efficiency of 2 household objects.
Your investigations can be based on theory
You need to provide an “estimated” figure for the overall efficiency of the device.
For the transformations, explain the transformations taking place, identify the useful “desired” energy and suggest a figure for the device efficiency.
(It will be useful to condsider your investigations into efficiency and
to remember that heat energy is nearly always produced in
transformations)
Device efficiency: _________________ %
Describe the transformations taking place and how you came to your
estimated figures. Try to explain how the energy wasted could be minimised.
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