Magnetism from electricity In 1820 Danish scientist Hans Christian Oersted discovered accidently that when electricity passed through a wirea magnetic field was created Which way would the compass needles point if we placed them around the wire ID: 710087
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Slide1
Magnetism from electricitySlide2
Magnetism from electricity
In 1820, Danish scientist
Hans Christian Oersted
discovered accidently that when electricity passed through a wire…a magnetic field was createdSlide3
Which way would the compass needles point if we placed them around the wire?Slide4
Without a current….with a current
A magnetic field is
induced
by the currentSlide5
Electromagnet
A current carrying coil of wire with many loops is called an electromagnetSlide6
Superconducting electromagnets
The most ignominious military use of superconductors may come with the deployment of "E-bombs". These are devices that make use of strong, superconductor-derived magnetic fields to create a fast, high-intensity electro-magnetic pulse (EMP) to disable an enemy's electronic equipment. Such a device saw its first use in wartime in March 2003 when US Forces
attacked an Iraqi broadcast facility
. Slide7Slide8
Magnetism and Electricity are related
Magnetism from Electricity
Many moving charges (an electric current) produce a magnetic field
Electricity from MagnetismSlide9
Question of the day
If you can make a magnet from electricity, can you also make electricity from a magnet?Slide10
Michael Faraday
It was largely due to his efforts that electricity became practical for use in technology. His efforts created the “ancestor” of the electric motor and generators.
Discovered electromagnetic induction (1831) ….which was a turning point in physicsSlide11
Electricity from MagnetismSlide12
Current is
induced by changing the magnetic field
Consider that there is no power source, but if you move the magnet or move the wire…current in created Slide13
REVIEW
Which moves to create current? The wire or the magnet?Slide14
Does this mean we get something (energy) for nothing?
The law of conservation of energy states that the Force times the distance traveled = Work done…
Work input = work output (or energy stored)Slide15
What can you do to create more current?
Faraday’s Law
Increase the # of loops
Make the magnet or wires move fasterSlide16
“The Great Revolution”…Einstein
http://www.youtube.com/watch?v=TEVEBzNSwTU
And part 2