Electricity and Magnetism

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Presentation transcript:

Electricity and Magnetism

Moving Charges and Magnetic Fields Moving charges produce magnetic fields Magnetic field lines form circles around a wire The direction of the field reverses as the current reverses

Electromagnets A temporary magnet made by wrapping a wire coil carrying a current around an iron core Solenoid  wire wrapped into a cylindrical coil

Speakers Contains an electromagnet connected to a flexible speaker cone made of paper, plastic, or metal Electrical Energy  Mechanical Energy  Vibrates Speaker Cone  Produces Sound

How A Speaker Is Made Speaker Video