electricity and magnetism. moving charges and magnetic fields moving charges produce magnetic fields...
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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
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