:shock: is electronic really for you. I do believe on this forum we have gone over OHM's law with you umpteen times

Without a resistor no current could flow, it would be an open-cct and only a voltage would be developed across the windings

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Nothing is impossible.
Once a problem is realised, the rest is just details

 

Why does it take a Resistor to have current to flow?

I thought a resistor was just a piece of wire with opposition

I can understand the opposition part of a resistor but i don't understand
about how it converts current into voltage

A resistor is a voltage and current opposition

If i put 1ma of current into a resistor , the resistor is opposition
the current

But if i put in 1ma of current into a resistor it converts 1ma into voltage
thats i don't get sorry

 

yes i know ohms law but im trying to understand how the resistor works inside and how it converts current into voltage without using ohms law just to understand the theory and function of the resistor

 

in "opposing" the current it produces a voltage across it

__________________
Nothing is impossible.
Once a problem is realised, the rest is just details

 

walters, sometimes it is best just to accept

Like in this case just accept when current flows through a resistor a voltage will be developed across it

Equally accept that ferrous materials are magnetic

Why do these things happen? well that is for physists and not electronic hobbist. if you want ot find out you can

__________________
Nothing is impossible.
Once a problem is realised, the rest is just details

 

Study Ohm's Law.

Everything has a resistance! A voltmeter or preamp's input has a resistance.

__________________
Uncle $crooge

 

Thanks for the help

in "opposing" the current it produces a voltage across it

See that seems weird i understand about the opposing the current part but how does it produes a voltage across from just opposing currrent a resistor inside is just a piece of wire and other materials

I can understand if the resistor just opposed the current but the resistor opposing the current and at the same time it creates or produces a voltage across it how is it the other materials inside the resistor that does this?

 

ferromagnetism

Ferromagnetism are atoms that produce a magnet or magnetism
ferromagnetism form a fixed flux and a magnetic field

 

ok me saying "in opposing current a voltage is developed" isnt really true

it is a way of looking at a situation that is only valid if viewed that way. IF you use that arguement outside the region it was formed it, it is broken.


Current flows because the existance of voltage, not the other way round.
You can never had current without voltage. BUT you can have voltage without current (doesn't mean you can measure it)

IF you left the coils of the winding open then a voltage would be developed. now if you were to just use that voltage as the input to an OPAMP (OPAMP with extreamly high input impedance) then you would get negliable current flowing.

However, the guitar would not soud good, it needs some current to flow to get the magentic core to a flux density so it sounds correct. Thus some form of load to allow current to flow is added

__________________
Nothing is impossible.
Once a problem is realised, the rest is just details

 

I thought this forum is to discuss electronic circuits, not high school physics and chemistry.

__________________
Uncle $crooge

 

Err kinda.
What it is to do with is the spin of electrons.

As you know when electrons flow through wire they produce a magentic field (Why? well you need to get a Phd in Chem/Physics for that)

Now if you look at the atomic structure of elements they have electron orbits. in these orbits the electrons spin (it is this spin that is used in Quantum computing). BUT in almost all elements the number of clockwise spins equal the number of anti-clockwise spin

Thus the net field is ZERO or extreamly small.

Iron is different, it has a major imballance in electron spin, so the majority of electrons spin in a given direction, thus all contributing to a magnetic field

__________________
Nothing is impossible.
Once a problem is realised, the rest is just details

 

Electronics is a branch of Physics

magentic core to a flux density

Doesn't the magnet produce flux density on its own
Because a magnet by itself have flux and a magnetic field
from the Ferromagnetism inside the magnet

To increase the flux density would need more wire turns?

The flux density is from the magnets material strength?

 

As you know when electrons flow through wire they produce a magentic field (Why

Because the Battery - and + its a potental difference

Magnetic field consists of flux lines because of the North and South pole
and a battery have a - and + so its like a north and south pole

 

The hysteresis of the B-H curves guitar pickups

The B-H Curves for guitar pickups

B= 0 = unmagnetized= flux density
H= Magnetized Force

H= Magnetized force can be increased or decreased by varying the current
which is hitting the guitar string through the coil of wire

What is the Cross Sectional Area?

what is the Reluctance?

 

Graphing hysteresis curves the B-H curves have positive and negative Saturations

What these saturations mean?