https://padlet.com/ckuo/lzeqvoqelir7 Summary of Chapter 7 en-us 2017-11-09 17:49:39 UTC 2023-02-18 14:07:45 UTC hello@padlet.com ckuo https://padlet.com/ckuo/lzeqvoqelir7/wish/205409532
More than 2000 years ago magnetic minerals were found, they were called magnetic stones. Now they are called magnetite. Since it was discovered many devices were developed. magnets have a force, if you are closer it becomes stronger if you are farther away it is weaker. Each magnet has a magnetic field lines to represent the magnetic field. A magnet also has a magnetic pole, this part is the strongest on the magnet(usually at the end of the magnet). N and S are the sides of the magnet. N and N oppose each other and N and S attract each other. A magnetic field always points away from the N and points at S. Earth is like a giant magnet and it can help determine the direction, In most materials the electrons magnetic properties cancel out but in some  it doesn´t ant hat makes a material magnetic. N magnet poles point at the same direction.

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In 1820 it was found that electricity and magnetism were related. Oersted´s hypothesis that an electric current creates a magnetic field was correct. Electromagnetism is the interaction between electric charges and magnets and electromagnetic force is the attraction or repulsion between electric charges and magnets. A magnetic force in a current carrying wire can be changed by changing the wire´s shape, this magnetic force is an electromagnet but it is only temporary. An electromagnet behaves like any other magnet. Electromagnets can be very useful since since the power can be changed manually. Electromagnets are used in every day objects you use such as speakers, computers, cellphones, etc. Electric motors are also used in every day objects such as computers, hair dryers, fans, etc; fans use electric motors to turn the blades  We use a galvanometer to measures electric currents using electromagnets. 

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It was found in 1831 that moving a loop of wire through a magnet created an electric current in the wire. Electromagnetis induction is the generation of an electirc current by a changing magnetic field.]]> 2017-11-09 18:22:45 UTC https://padlet.com/ckuo/lzeqvoqelir7/wish/205427495 ckuo https://padlet.com/ckuo/lzeqvoqelir7/wish/206279379 2017-11-13 15:13:56 UTC https://padlet.com/ckuo/lzeqvoqelir7/wish/206279379 ckuo https://padlet.com/ckuo/lzeqvoqelir7/wish/206285429 2017-11-13 15:22:32 UTC https://padlet.com/ckuo/lzeqvoqelir7/wish/206285429 ckuo https://padlet.com/ckuo/lzeqvoqelir7/wish/207804911 2017-11-16 17:49:00 UTC https://padlet.com/ckuo/lzeqvoqelir7/wish/207804911 ckuo https://padlet.com/ckuo/lzeqvoqelir7/wish/207805599 2017-11-16 17:50:05 UTC https://padlet.com/ckuo/lzeqvoqelir7/wish/207805599 ckuo https://padlet.com/ckuo/lzeqvoqelir7/wish/209400800 2017-11-22 10:59:22 UTC https://padlet.com/ckuo/lzeqvoqelir7/wish/209400800