
OK, allow me introduce Sir. Michael Faraday...
Faraday's law of induction is a basic law of electromagnetism relating to the operating principles of transformers, inductors, and many types of electrical motors and generators. The law states that:
"The induced electromotive force (EMF) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit."
Or alternatively:
"The EMF generated is proportional to the rate of change of the magnetic flux."
In Faraday's first experimental demonstration of electromagnetic induction (August 1831), he wrapped two wires around opposite sides of an iron torus (an arrangement similar to a modern transformer). Based on his assessment of recently-discovered properties of electromagnets, he expected that when current started to flow in one wire, a sort of wave would travel through the ring and cause some electrical effect on the opposite side. He plugged one wire into a galvanometer, and watched it as he connected the other wire to a battery. Indeed, he saw a transient current (which he called a "wave of electricity") when he connected the wire to the battery, and another when he disconnected it. Within two months, Faraday had found several other manifestations of electromagnetic induction. For example, he saw transient currents when he quickly slid a bar magnet in and out of a coil of wires, and he generated a steady (DC) current by rotating a copper disk near a bar magnet with a sliding electrical lead ("Faraday's disk").
Faraday explained electromagnetic induction using a concept he called lines of force. However, scientists at the time widely rejected his theoretical ideas, mainly because they were not formulated mathematically. An exception was Maxwell, who used Faraday's ideas as the basis of his quantitative electromagnetic theory. In Maxwell's papers, the time varying aspect of electromagnetic induction is expressed as a differential equation which Oliver Heaviside referred to as Faraday's law even though it is slightly different in form from the original version of Faraday's law, and doesn't cater for motionally induced EMF. Heaviside's version is the form recognized today in the group of equations known as Maxwell's equations.
Faraday explained electromagnetic induction using a concept he called lines of force. However, scientists at the time widely rejected his theoretical ideas, mainly because they were not formulated mathematically. An exception was Maxwell, who used Faraday's ideas as the basis of his quantitative electromagnetic theory. In Maxwell's papers, the time varying aspect of electromagnetic induction is expressed as a differential equation which Oliver Heaviside referred to as Faraday's law even though it is slightly different in form from the original version of Faraday's law, and doesn't cater for motionally induced EMF. Heaviside's version is the form recognized today in the group of equations known as Maxwell's equations.
I wonder...
Without Maxwell, The Faraday law would never be accepted... beacuse of LACKING OF SCIENTIFIC SUPPORT. the empirical scientist used to be a a ultrage for all intelectuals.
But...
Nowadays in a world where information just pop out toward our starving eyes, not always we consider to check out the sources or look into the real premisses of information, everybody believe in everthing as long there's no time to check out any information
There's junky food ( not simply fast food) and now "Junky information"( not simply fast information)
On the other hand, there are some people that despite of scientific formal skills can naturally surpass the straight science by the enforces of creativity, and can bring a new meaning for everything... it might be the power of syntesis and analogies, so needed to be understood by those who hardly can understand the scientific language, they just cut the crap and hit the ground running, toward to the point, straight into the bull's eye.
But... those new empirical scientists, teechers, visionaries, businessmen or even goodfellas must save all scientific knowledge possible due to have support for their theories... or we'll have the junky information again. The empirical intelectuals must have a great MAGNETIC personality, a MAGNETIC comunication skill ( or ability, or gift... ) because the new world is starving for the POWER of information to keep MOVING.
I said MAGNETIC and POWER
Yes... there's a relation between magnetic field and energy...
"The EMF generated is proportional to the rate of change of the magnetic flux"
Faraday was right... for sure.
great
ResponderExcluirVery good idea teacher!
ResponderExcluirIt's a very good tool to improve our communication.
Regards,
Eduardo Bastos
Everything is very open with a very clear description of the challenges.
ResponderExcluirIt was definitely informative. Your site is extremely helpful.
Thank you for sharing!
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