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"Electromagnet" Energy PPT Courseware 3
A device composed of a coil and an iron core is called an electromagnet
How to make an electromagnet:
Use an insulated wire to wrap 50-100 times in one direction around a large iron nail, leaving 5-10 cm at both ends of the wire as lead wires.
Test the nail electromagnet:
Connect the two ends of the wire to the battery and see if it can pick up the gasket.
Because the wire used is short, this electromagnet consumes a lot of power. Do not leave it connected to the battery for a long time.
Do electromagnets have north and south poles?
Connect both ends of the wire to the battery, and bring the tip of the iron nail close to the compass.
If the tip of the nail attracts the North Pole of the compass and repels the South Pole, then the tip of the iron nail is the South Pole.
The tip of the nail attracts the South Pole of the compass and repels the North Pole, so the tip of the iron nail is the North Pole.
Experiment 1: 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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