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Copyright © 2011 InteractiveScienceLessons.com
Electromagnets-6 mini investigations
Have books open to page ___ for some readings
Copyright © 2011 InteractiveScienceLessons.com
Task: Build an electromagnet.
Copyright © 2011 InteractiveScienceLessons.com
Good job everyone.
Copyright © 2011 InteractiveScienceLessons.com
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.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets1. 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.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets1. 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.
Copyright © 2011 InteractiveScienceLessons.com
Task 3: Wind the wire 10x more.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets1. 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.
Copyright © 2011 InteractiveScienceLessons.com
Task 4: Reverse the current.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets1. 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).
Copyright © 2011 InteractiveScienceLessons.com
Task 5: Remove the nail.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets1. 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.
Copyright © 2011 InteractiveScienceLessons.com
Task 6: Double the current.
Copyright © 2011 InteractiveScienceLessons.com
Electromagnets1. 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.
Copyright © 2011 InteractiveScienceLessons.com
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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