By: Brandon W

Brandon W — Mon, 16 Mar 2009 00:51:24 +0000

1.An electric motor converts electric current into mechanical force. An electric generator converts mechanical force into electric current.
2.1269 that the first Western account of a magnet and its properties "Epostolia de Magnete", was written by Petrus Perigrinus in 1269.
3.Southern Lights are known as Aurora Australis.
4.A field in mathematics is something which exists throughout a region and which has a definite value at every point within that region.
5.The true mariner’s compass used a pivoting needle in a dry box, and was invented in Europe no later than 1300.
6. 1500 km is the distance between the north and south pole
7.the small group of atoms who have aligned magnetic fields are called magnetic domains
8. Hans Christian Oersted is who hypothesized that an electric current produces a magnetic field
9.The electromagnet is a wire coil that is usually wrapped around a piece of iron. When running electrical current through the wire it creates a magnetic field. With an electromagnet you can change its magnetic pole. When the flow of the current is changed the north and south poles of the wire switch. The stereo signal does this; it constantly switches the flow of electricity, electrical energy is converted to mechanical energy, which vibrates the cones to make sound.
10.Jedlik’s electric motor was invented by accident in 1873, when Zénobe Gramme connected the dynamo he had invented to a second similar unit, driving it as a motor. The Gramme machine was the first electric motor that was successful in the industry.
11.cobalt-Co, Fe iron, Ni nickel
12.In 1888 Nikola Tesla invented the first practicable AC motor and with it the polyphase power transmission system.
13.Earth’s magnetic poles have changed places over 150 in the past seventy million years.
14.
15.the needle lines up with north and south pole
16. It changes twice with each revolution
17.The commutator reverses the direction of the current in coil.
18.This light display occurs when blast of charge particles from the sun a captured by the earth’s magnetic field.
19.
20.Aurora Borealis is the scientific name for the northern light’s
hey i cant find 19 i suggest getting it from someone in your class
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By: Yeahhhbuddy

Yeahhhbuddy — Sun, 15 Mar 2009 19:28:18 +0000

your mom. haha jk. who is this? you go to queens grant right? i have this assignment too.
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Comments on: magnetisim geniuses. i need your help. please?

By: Brandon W

By: Yeahhhbuddy