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8th Grade Ch. 3 Sec. 1 What is Electromagnetism?Presentation Transcript
Ch. 3 Sec. 1What is electromagnetism?
electromagnetismrelationship between electricity & magnetismelectric current produces magnetic field
Magnetic Field Map Iron filings show the magnetic field linesaround a wire with a current. What is the shape of the field lines?
solenoid coilof wire w/ current strength of magnetic field increases as # of loops (coils) increase
The magnetic field around a solenoidresembles that of a bar magnet.
electromagnetsolenoid w/ ferromagnetic corestrong magnet that can be turned on & off
ways to increase strength of electromagnets1. Increase current2. Add more loops of wire3. Wind coils closer together4. Use stronger ferromagnetic material for core Online Interactive Activity-Make an electromagnet
electromagnets at work doorbell junkyard crane
Roller coasters uses electromagnets to launch and stop the roller coaster.
Olivias Challenge: Build Your Own Electromagnet [00:24]
Make an electromagnet1. How many paper clips will your electromagnet hold?2. Can you hang paper clips on both ends of the nail?3. How can you make your electromagnet stronger?4. After using the electromagnet, remove the iron nail. Can the nail still pick things up? If so, why?
Additional experiments to try: 1. Change the shape of the armature (coil of wire) 2. Hold the magnet above the coil.
Electromagnet experiment # of coils # of paper clips picked up Coils close together or far apart Amount of current