Electromagnets

ElectromagnetsMrs. BrostromIntegrated Science CObjective:Describe the relationship between current and magnetism.What is magnetism?Created by moving electric charges (electrons)Has north and south polesA compass aligns with Earths magnetic fieldWhat happens when the compass is brought near an electric current? Needle is deflected (moved)

What is magnetism?In magnetic materials like Iron (Fe):Caused by electrons moving around the nucleusGroups of atoms join togetherThe magnetic field of each atom adds together to create a larger magnetic field

ElectromagnetsElectricity and magnetism are relatedElectric current in a wire creates a magnetic fieldThe stronger the electric current, the stronger the magnetic field

ElectromagnetsA coil that has a soft iron core and that acts as a magnet when an electric current is in the coil is called an electromagnet.A coiled wire creates a greater magnetic fieldEach loop increases the magnetic fieldCalled a solenoidSafer than increasing electric current

ElectromagnetsOne use of electromagnets is doorbells

ElectromagnetsScrap-metal cranes also use electromagnets

ElectromagnetsLoudspeakers are also electromagnets

ElectromagnetsHouse telephones are also electromagnets

What type of energy transfer occurs with electromagnets?electromagnetic to electricalLets try it outIts time to build your own electromagnet