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Planning Exercises
continued
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Exercise 7
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The efficiency of a transformer gives
a measure of how well energy is transferred from the supply to the
load. (The "load" is the component connected to the
secondary coil.) Efficiency is defined as the ratio of output
power to input power and is usually expressed as a percentage.
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Design an experiment to measure the
efficiency of a transformer. Include a circuit diagram, a brief
method and explain clearly how you would analyse your results.
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Can your measurements be used to
decide what is the main cause of inefficiency in the transformer
under investigation?
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Back to Choice
Table
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Exercise 8
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You are provided with the following
apparatus: a swimming pool and a test tube. Explain how you could
verify the Boyle/Marriotte Law.
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Back to Choice
Table
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Exercise 9
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Design an experiment to measure
(estimate) the acceleration of a "Metro" train. The
apparatus is to be used by someone inside the train and
must have a total cost of not more than one or two
Francs !
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Back to Choice
Table
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Exercise 10
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Design an experiment to find how the
force between two magnets varies with their separation. This one
can cost as much as you like !
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Back to Choice
Table
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Exercise 11
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How does the force of air resistance
vary with speed for a table tennis ball ? Design an experiment to
verify your hypothesis.
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Back to Choice
Table
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Exercise 12
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What factors would you expect to
affect the "lifetime" of a filament light bulb ?
Describe an experiment to investigate at least one of these
factors.
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Back to Choice
Table
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Exercise 13
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Describe an experiment to investigate
the factors affecting the output power provided by a solar energy
conversion system. For at least one variable, state how the
output power of the system might be expected to depend on that
variable.
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Back to Choice
Table
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Exercise 14
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How would you expect the torque
produced by a simple d.c. motor to depend on the current flowing
through the coils of the motor ?
Describe an experiment to verify your prediction.
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© David
Hoult 2008 |
The
Open Door Web Site