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"Magnetic Force of Electromagnets" Magical electromagnet PPT courseware
friendly reminder
We can design an experimental plan in table format. The design of the record table can have the following columns:
1. What topic has your group decided to research?
2. What conditions should be controlled unchanged in the experiment? Which conditions need to be changed?
3. What materials are needed for research?
4. Record the experimental results (record the number of pins picked up)
Experiments to study the magnetism of electromagnets
On and off switch
Electromagnet ____________ during power outage
When energized, the electromagnet___________
in conclusion
The electromagnet is _____magnetic when energized and _____magnetic when deenergized.
Making and researching electromagnets
1. Study the magnetism of electromagnets
in conclusion
Air Core Magnetic ( )
Insert the iron core and the magnetism of the electromagnet ( )
(2) Study the relationship between the magnetic strength of the electromagnet and the current
Phenomenon
Increase the current and the number of pins attracted by the electromagnet _____.
in conclusion
The more ____ the current passes through the electromagnet, the more magnetic it becomes _____.
(3) Study the relationship between the magnetism of the electromagnet and the number of coil turns
Phenomenon
The more ______ the number of turns, the more ______ the magnetism.
in conclusion
When the current is constant, the number of turns of the electromagnet coil is ______, and the magnetism is ______.
Experimental results
When the electromagnet is energized, it is ____magnetic, and when it is de-energized, it is magnetic ______; the more current passing through the electromagnet is ____, the magnetism of the electromagnet is ______; when the current is constant, the number of turns of the electromagnet coil is _____, and the magnetism is ____. Insert the iron core, the magnetism of the electromagnet _____, shorten the distance between the wound wire and the iron core, the magnetism of the electromagnet _____,
Class exercises
1. The electromagnet has many advantages: its magnetism can be controlled by ______, the strength of the magnet can be controlled by ________, and the polarity of the magnetic pole can be controlled by ________; insert _____ in the coil _It becomes an electromagnet and its magnetism is greatly enhanced. When the current is constant, the turns of the electromagnet coil _____, the stronger the magnetism
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