GreenAce92
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Yoy can't get an electron flow without a closed circuit,
Hi,
I'm not sure about this statement.
For a transformer, I agree.
But how does this happen when you fire an electron beam into the orbit? I really don't know..
Klaus
... but the electrons being generated, where do they come from and can they run out?
"free electrons"
Pretty sad that I am asking this when I took E&M as a physics major 3 years ago.
"When a conductive wire is in a magnetic field, current is induced"
Right hand rule, point your thumb in the direction of the current, magnetic field around wire.Or is it simply orthogonal to the wire? Anyway...
When you take rotational motion from an outside source whether a spinning turbine or up/down motion of a wave, the wires are cutting through a magnetic field... but the electrons being generated, where do they come from and can they run out?
"free electrons"
Anyway, I'd appreciate a very detailed response.
Thank you
There is a postulate which says that there no exists magnetic field, nor electric field, but both walk together, which means that one generate other and vice-versa. I admit that never thought about this question, but without googling anything, in a brainstorm I would dare to say that those “free electrons” exists and perhaps should be related to some term of the universal constant electric of the vacuum; Just a guess.
Electrons do move but not very fast, electric power is a complete path. If one electron leaves then another enters.
https://www.physlink.com/Education/AskExperts/ae69.cfm
hehe , electrons never end
Given the atomic structure of material , electrons are organised on orbits (k,l,m,n,o,p ...) around the nucleus . Usually electrons from last orbits can go from 1 atom to an other since they have more loose connection in the atom . If the circuit is closed , this is what happens , electrons travel in the material from 1 atom to the other so that the structure of each individual atom remains same (total number of electrons ). That's electric current . (the ordinary movement of electrons ). If this path is cut (open circuit > the next atom is not there anymore) the current flow stops . This movement of electrons of in material does not happen by itself , an exterior excitation is needed to produce the displacement. Without that the electrons are rotating around nucleus like usual
the electric voltage that is generated (due to the mag field and rotation) drives the current through the circuit.
one is , it is a conductor('conductor/insulator-difference is based on no of electrons available for conduction)
so electrons are available in the materials.
(there is no 'generation of electrons')
those electrons are directed by the voltage generated(electric field) to flow through the circuit.
we say , a current is flowing in the circuit.
Nothing much to that question. The charge carriers (electrons) are being pumped around the conductive path. There is no "electron generation". Open the conduction path, no more current.
when a conductor is moved in a magnetic field, the field sweeps many of the outer orbit electrons which are loosely bound to the nucleus, to one end of the conductor. If the circuit is completed then these electrons repel the electrons in the external circuit and a current flows. The electrons do not move very fast, about 25mm a second, but they jump from their present orbit, to the orbit of another atom very quickly (the speed of light). So the apparent speed is very fast, from one electron in to one electron out, though its not the same electron.
The amount of electrons and their energy is determined by the speed and strength of the magnetic field. The amount of loose electrons determines the maximum current (10 ^+23 electrons/second = 1 amp), and their energy determines the EMF (Electro Magnetic Force), which is measured as a voltage.
Frank
It is not completely inconceivable the leakage of some of these electrons from the closed circuit, as well free electron to occur flowing around the space, although I have doubts if they could be easily recombined. Anyway here there are good insights:
Charge flows, but not current. Current is charge flow, so "current flow" means "charge flow flow", which is redundant and ridiculous. One should say that current is present or current exists.
Ratch
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Wrong terminology. One should say current exists or is present in a circuit.
Ratch
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