Give 10 electromagnet minimum of materials
Answers
Answer:
(1)Make sure each student pair has the following materials: 1 nail, 2 feet (.6 m) of insulated wire, 1 D-cell battery, several paperclips (or tacks or pins) and a rubber band.
(2)Wrap the wire around a nail at least 20 times (see Figure 4). Ensure students wrap their nails tightly, leaving no gaps between the wires and not overlapping the wraps.
(3)Give the students several minutes to see if they can create an electromagnet on their own before giving them the rest of the instructions.
To continue making the electromagnet, connect the ends of the coiled wire to each end of the battery using the rubber band to hold the wires in place (see Figure 4).
(4)A photograph shows a nail wrapped in red wire with the wire ends connected with a rubber band to opposite ends of a D-cell battery. Figure 4. Setup to make an electromagnet using a battery, wire and nail.
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(5)Test the strength of the electromagnet by seeing how many paperclips it can pick up.
(6)Record the number of paperclips on the worksheet.
(7)Disconnect the wire from the battery after testing the electromagnet. Can the electromagnet pick up paperclips when the current is disconnected? (Answer: No)
(8)Test how varying the design of the electromagnet affects its strength. The two variables to modify are the number of coils around the nail and the current in the coiled wire by using a different size or number of batteries. To conserve the battery's power, remember to disconnect the wire from the battery after each test.
(9)Complete the worksheet; making a list of ways engineers might be able to use electromagnets.
Conclude by holding a class discussion. (10)Compare results among teams. Ask students the post-assessment engineering discussion questions provided in the Assessment section.