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Magnetism | #aumsum #kids #science #education #children

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Magnetism:
(magnets)
More than 2,000  years ago ,the Greeks discovered deposits of a mineral that was a natural magnet.  Since  the discovered of magnetite, many devices have been developed that rely on magnets.magnetism refers to the properties and interactions of magnets.

Magnetic force: Depending on which ends of the magnets  are close together, the magnets either repel or attract each other.

Magnetic strength: you might also have noticed that some magnets  are stronger than other.

Magnetic field:

A magnet can exert a force a force on a distant object because of its  majic field the affects the use  of the magnet,

magnetic field lines: the magnetic field can be represented  by line,you might have also noticed in figure 2 that the magnetic field lines are closest together  at the ends of the bar magnets,whether  two magnets attract or repel each
other  depends on which poles are brought close together ,a magnetic field also has a direction, because the needl's north pole points to a location near earth geographic north pole
oppsite magnetics pole attract , no one is certain what produces Earths magnetic field.

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moving electric charges,such as electric currents , are surrounded by magnetic fields .

the electromagnetic force is one of the fundamental forces.

An electromagnetic is a temporary magnec consisting of a current-carrying wire wrapped around an iron core .

the magnetic field strength  of an electromagnetic can be controlled by changing the number of ware loops and by changing the current in the ware .

in a simple eletric motor , an electromagnetic rotates between the poles of a permanent magnet.

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Producing Electric Current.
Á changing macnetic field can indice a current in a wire.

A generator transfors mechanical energy into electrical energy .

direct current in current in one direction. alternating current changes direction in a regular pattern .

A transformer increases or decrases the voltage of an alternathing current..