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