Magnetism and Electromagnetism
Haley Henson and Sadie Martinez
Georg Ohm
Charles-Augustin de Coulomb
Joseph Henry
Heinrich Hertz
Aurora Borealis
Electromagnetic Induction
5 ways humans have used electromagnetism to improve our lives:
3 Inventions that use electric forces
Transformer
The transformer breaks down the voltage and it sends it to the switchgear. It sends the broken down voltage to the lines that go to a house.
Electrical Motor
An airboat electric boat
Electrical Generator
Generator at Austin Energy
Inventions using magnetic force
Compass: A compass consists of a small, lightweight magnet balanced on an almost frictionless point. The south end points at the North and the north end points at the South. So the needle technically points North.
Credit Cards: Credit Cards are capable of storing data by modifying the magnetism of tiny iron-based magnetic particles on a band of magnetic material on the card.
Security Devices: In this technology, a magnetic, iron-containing strip with an adhesive layer is attached to the items. It is deactivated by a scanner that uses a specific highly intense magnetic field.
MRI: MRI machines use a superconducting magnet, which consists of many coils or windings of wire through which a current of electricity is passed, creating a magnetic field.
Refrigerator Magnets: When a magnet is placed on the fridge door, that section of the refrigerator covered by the magnet actually rearranges on an atomic level to become another magnet
Magnetic recording media: Magnetic storage uses different patterns of magnets in a magnetized material to store data.
TV: In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode.
Speaker: . It has a diaphragm that is vibrated by sound waves in an area. The signal from a microphone gets encoded on a tape or CD as an electrical signal. When you play this signal back on your stereo, the amplifier sends it to the speaker, which re-interprets it into physical vibrations.
Microphones: Microphones convert sound waves into audio signal. When the diaphragm vibrates, it causes other components in the microphone to vibrate. These vibrations are converted into an electrical current which becomes the audio signal.
Scrap metal crane: A magnetic crane works by picking an object using the magnetic pull of the magnet. Its capacity to pick higher loads depends upon the power of the magnet.
Things that use electromagnetic induction
Work Cited
“George Simon.” Britannica School. Encyclopedia. Britannica Inc., 2013. Web. 20 March 2013. http://school-preview.eb.com/levels/high/article/56864
“Charles-Augustin de Coulomb.” Britannica School. Encyclopedia. Britannica Inc., 2013. Web. 20 March 2013. < http://school-preview.eb.com/levels/high/article/26555>
"Britannica School." Britannica School. N.p., n.d. Web. 22 Mar. 2013.
"Britannica School." Britannica School. N.p., n.d. Web. 22 Mar. 2013.
http://en.wikipedia.org/wiki/Magnetic_stripe_card
http://adventure.howstuffworks.com/outdoor-activities/hiking/compass1.htm
http://electronics.howstuffworks.com/everyday-tech/anti-shoplifting-device4.htm
http://www.ehow.com/how-does_4739775_refrigerator-magnet-work.html
http://en.wikipedia.org/wiki/Magnetic_storage
http://electronics.howstuffworks.com/speaker2.htm
http://www.mediacollege.com/audio/microphones/how-microphones-work.html