Transcript PPT-Electromagnets - Interactive Science Teacher

Electromagnets6 mini investigations
Have books open to page ___ for some readings
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Task: Build an electromagnet.
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Good job everyone.
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One wire tucked in
permanently.
Other touches
on/off.
Wire wound
evenly from top
to bottom
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Task 1: Find the strongest part.
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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
1. The strongest part of an electromagnet is…
at the ends, just like on a bar magnet.
2. Disconnecting the electricity causes…
it to lose its magnetism.
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Task 3: Wind the wire 10x more.
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Electromagnets
1. The strongest part of an electromagnet is…
at the ends, just like on a bar magnet.
2. Disconnecting the electricity causes…
it to lose its magnetism.
3. Winding the wire 10 more times causes…
the magnetism to become stronger.
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Task 4: Reverse the current.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets
1. The strongest part of an electromagnet is…
at the ends, just like on a bar magnet.
2. Disconnecting the electricity causes…
it to lose its magnetism.
3. Winding the wire 10 more times causes…
the magnetism to become stronger.
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
1. The strongest part of an electromagnet is…
at the ends, just like on a bar magnet.
2. Disconnecting the electricity causes…
it to lose its magnetism.
3. Winding the wire 10 more times causes…
the magnetism to become stronger.
4. When the 1.5 volt current is reversed…
nothing changes (that we can see).
5. Removing the iron core (nail) causes…
it to lose (most of) its magnetism.
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Task 6: Double the current.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets
1. The strongest part of an electromagnet is…
at the ends, just like on a bar magnet.
2. Disconnecting the electricity causes…
it to lose its magnetism.
3. Winding the wire 10 more times causes…
the magnetism to become stronger.
4. When the 1.5 volt current is reversed…
nothing changes (that we can see).
5. Removing the iron core (nail) causes…
it to lose (most of) its magnetism.
6. Doubling the electricity causes…
the magnet to become stronger.
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Clean up
• Straighten the wire
• Reduce residual charge in nail by
throwing it down on hard floor
• Put 4 new handouts in your box
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