Power Point Presentation Electromagnets Mod.ppt

Electromagnets

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Electromagnets:
6 mini investigations
Have books open to page 628
for some readings

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Task: Use the equipment
in your box to build
an electromagnet.

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Good job everyone.

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Wire wound
evenly from top
to bottom
One wire tucked in
permanently.
Other touches
on/off.

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Task 1: Find the strongest
part of the electromagnet.

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Electromagnets
1.The strongest part of an
electromagnet is…
at the ends, just like on a bar
magnet.
Read p. ___ ¶ __ together

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Task 2: Disconnect
the current.

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Electromagnets
2.Disconnecting the electricity
causes…
it to lose itsmagnetism.

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Task 3: Wind the wire
10x more.

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Electromagnets
3.Winding the wire 10 more times
causes…
the magnetism to become stronger.

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Task 4: Reverse the current.

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Electromagnets
4.When the 1.5 volt current is
reversed…
nothing changes (that we can see).

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Task 5: Remove the nail.

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Electromagnets
5.Removing the iron core (nail)
causes…
it to lose (most of) itsmagnetism.

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Task 6: Double the current.

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Electromagnets
6.Doubling the electricity causes…
the magnet to become stronger.

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Try to pick up the car!

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Clean up
•Straighten the wire
•Reduce residual charge in nail by
dropping it down GENTLY on hard floor
•Put all the parts back in your bin and
return it to my desk

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Uses of Magnets
•Read pp.628 –631 in your Physical
Sciencetextbook.
•Read about some of the uses of
electromagnets.
•Generators and Motors
•Transformers

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Uses of Magnets
•Your group will investigate a use for
magnets and share with the class on
the big whiteboards.
•Include a picture and an explanation!