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Authoritative PPT Summary
"Electromagnet" Energy PPT Courseware 2
Step-by-step instructions for "winding a coil around an iron nail"
1. Wrap the wire around the nail in the same direction.
2. The more coils, the better, and a certain length of wire should be reserved.
3. Fix both ends of the wire with a pull-through method to prevent the coil from loosening.
Research activity: Are iron nails with coils magnetic?
Experimental equipment: iron nails with coils, batteries, wires, compasses, pins, switches
Experiment 1: Iron nails and compasses with coils
Connect the power supply, put the iron nail close to the compass, and observe what happens.
Disconnect the power and observe the experimental changes.
Experiment 2: Iron nails and pins with coils
Connect the power supply, put the iron nail close to the pin, and see if it attracts it?
Disconnect the power and observe the experimental changes.
Report and exchange:
What are the poles of the nail tip and nail head of the electromagnet in our group?
Are the nail tips and the magnetic poles of the nail heads of the electromagnets in each group the same?
Discussion: What factors are related to the north and south poles of the electromagnet?
Conjecture 1: It may be related to the positive and negative pole connections of the battery
Conjecture 2: It may be related to the direction of winding of the coil
"Electromagnet" Classroom Summary
A device consisting of an energized coil and an iron core is called an electromagnet.
Electromagnets have the basic property of producing magnetism when current is turned on and disappearing when current is turned off.
Changing the positive and negative connections of the battery or changing the direction of the coil winding will change the north and south poles of the electromagnet.
1. Electromagnets can produce magnetism, but they cannot indicate direction. ( )
2. Because the wire used is relatively short, the electromagnet consumes a lot of power, so it cannot be connected to the battery for a long time. ( )
3. The north and south directions of the electromagnet are related to the number of batteries. ( )
4. The device composed of a coil and an iron core is called ______. It produces ______ when it is powered on, and ______ disappears when the power is turned off.
5. Electromagnets also have north and south poles. The north and south poles of electromagnets are related to ____________ and ____________.
Experiment: The relationship between the north and south poles of the electromagnet and the battery
We guess: the north and south poles of the electromagnet are related to the connection method of the battery
Experimental equipment: battery, iron nails, 1-2 meters of insulated wire, a box of pins
The same conditions: the same nails, the same wires with the same winding method, and the number of battery cells
Different conditions: Change the connection method of the positive and negative poles of the battery (positive and negative pole conversion)
Experimental phenomenon: The tip of the nail attracts the south pole of the compass and repels the north pole, then the tip of the iron nail is the north pole. When the connection method of the positive and negative poles of the battery is changed, the north and south poles of the electromagnet change.
Our conclusion: The north and south poles of the electromagnet are related to the connection method of the battery.
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