Electricity and Magnetism
The world around us!
How Magnetism and Electricity affect each other
Three Inventions that take advantage of Electrical forces
Watch- a watch uses electricity to turn the gears that move the hands that tell you the time.
Light Bulbs- Electricity flows into the light bulb, as it passes through the filament the electricity charges the atoms of the filament, the atoms then emit photons thus producing light from electric.
Inventions that take advantage of magnetic forces
Credit Cards-The black strip on the back of the card has identification for the holder and allows for purchases.
Security devices at department stores- There is a magnet in the poles and on a tag attached to the item. When the item passes through the field, an alarm will sound if the tag is still attached or activated.
MRI- The MRI has a superconducting magnet bathed in liquid helium at -452.4 F.
VHS Tapes- Magnetism is used to record the video onto the tape of the cassette.
TV-The magnet in TV is used to steer the electron beam anywhere onto the screen.
Speaker- the electrical current flows through the voice coil reversing the coils polar orientation. the change in magnetic forces between the voice coil and the permanent magnet , moving the coil and attached diaphragm back and forth.
Microphones-Whenever the sound wave hits the diaphragm (a thin piece of paper, aluminum or something of that sort), the diaphragm vibrates past the magnet making a current and producing an audio signal.
Scrap Metal Crane-A big heavy duty electromagnet. A very strong copper wire with a lot of coils and a big current making a very strong magnetic field.