Magnetism Magnets Magnets opposite ends attract like ends

Magnetism

Magnets • • • Magnets: -opposite ends attract -like ends repel -most metals attract to magnets -we utilize magnetism and make compasses from Earth’s magnetic field • -The Earth is one big magnet with North and South poles. • -Magnets can be permanently magnetic or temporarily magnetic

Electricity and Magnetism • Electricity and Magnetism are Related • Electricity flowing through a wire creates a magnetic field around the wire • This creates an Electromagnet = A temporary magnet made of iron wire carrying an electric current.

Strength of Electromagnet • You can increase the strength of an electromagnet by… • increasing the number of coils. (a straight wire has a weak magnetic field) • increasing the amps of current.

Electromagnetic Induction • An electric current produces a magnetic field and a magnetic field can produce an electric current • *Running electric current through a wire or solenoid wrapped around iron creates a magnetic field or a magnet. • EX: electromagnet

Electric Charge • *Moving a loop of wire through a magnetic field creates an electric charge. • EX: Generators or simple motors

Generators • Generators: produce electric current by rotating a loop of wire through a magnetic field. The rotating magnets are connected to a turbine. The turbines are large wheels that rotate due to steam. The steam is created by the burning of fossil fuels or nuclear power