6th Grade Ch 3 Sec 1 What Is Electromagnetism
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Transcript of 6th Grade Ch 3 Sec 1 What Is Electromagnetism
Ch. 3 Sec. 1What is electromagnetism?
electromagnetism
relationship between electricity & magnetism
electric current produces magnetic field
Magnetic Field Map Iron filings show the magnetic field lines around a wire with a current. What is the shape of the field lines?
solenoid
coil of wire w/ currentstrength of magnetic field increases
as # of loops (coils) increase
The magnetic field around a solenoid resembles that of a bar magnet.
electromagnet
solenoid w/ ferromagnetic core
strong magnet that can be turned on & off
Electromagnets [02:16]
ways to increase strength of electromagnets
1. Increase current
2. Add more loops of wire
3. Wind coils closer together
4. Use stronger ferromagnetic
material for coreOnline Interactive Activity-Make an electromagnet
electromagnets at work
Olivia's Challenge: Build Your Own Electromagnet [00:24]
Make an electromagnet
1. 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.