Conventional current
Conventional current
(OP)
I have studied on italian and english books at university
and I have always found the universal use of "conventional current" ( from + to - )
Now I see lots of web pages use the real electonic flow
(from - to +) so I'd like to know if there's a new trend in the university use.
Thanks
and I have always found the universal use of "conventional current" ( from + to - )
Now I see lots of web pages use the real electonic flow
(from - to +) so I'd like to know if there's a new trend in the university use.
Thanks






RE: Conventional current
RE: Conventional current
I just took an University extension course in Power Electronics, some 35 years after leaving college and they still taught current flow + to -.
RE: Conventional current
"Look, just consider it as flowing from the excess to the deficiency and you'll never go wrong.".
Never had to think twice about it since.
jW
RE: Conventional current
Potential is an accumulation of elctrons on one side of a conductor which is called the -.
Due to the movement of electrons from an atom holes are created which is short of electrons.
Electrons flow from - to +.
The standard convention, therefore for current is from + to -. I have no idea any one has changed the convention, if so, who and why.
RE: Conventional current
Now that renzodel has started the topic, could someone explain why when a DC voltage is applied there is only a current flow intially, and when you apply an AC voltage there is a continuous current flow.
A technical explanation would be appreciated.
Regards
RE: Conventional current
The topic is across a Capacitor. DC Voltage and AC voltage.
RE: Conventional current
RE: Conventional current
Excellent. You have a strong foundation.
With due respect to others, I have met a few people who lack this understanding.
Thanks and regards
RE: Conventional current
Texas Instruments photographed electron flow in copper and hole flow in semiconductors back in the 70s.
As they say, a picture is worth a thousand words, and this put an end to most discussions of how current flows. Obviously a few of you younger people haven't seen or heard about this.
RE: Conventional current
I think you have misunderstood me. The physics of electricity is that electrons move and not holes. The definition of hole is "loss of electrons in atoms" and positively charged. This is in semiconductor theory. NPN / PNP transistors explain the theories. Have you read on electrostatic precipitation theory.
My question was on Capcitors. In the electricity theory we study as electron movement and not hole movement.
Just consider a DC Battery.
I would be very happy to investigate the theory of "hole" movement in semiconductors. Have you got any related articles from Texas on this phenomenon.
Regards
RE: Conventional current
RE: Conventional current
While "holes" appear to be simply the lack of electrons, they move in different energy bands and have different effective masses and mobilities. This is reflected in the saturation current characteristics difference between n-channel and p-channel MOS transistors.
TTFN
RE: Conventional current
mine was just a "statistical question"
for know if there is some tendence in the new physics books
or courses, tired to follow the Franklin convention,
to use the real electrons movement in a solid conductor.
...so what can U tell me about university books and courses?
Thanks
RE: Conventional current
Nothing's changed, it's still all taught the same way.
RE: Conventional current
The atomic theory has now been defeated by stating that holes move. The matter is a formation of nuclear bonding and the free electrons in some elements when lost they are said to be positively charged. The electron movement appear to indicate that holes move.
Nuclear fusion/fission??
Just as an example,
If I state that the mass of earth is increasing, would someone agree with me? Well you can figure out the reason.
For the earth to pull out of the sun's gravitational orbit it may take millions of years, Yeah?
Regards
RE: Conventional current
I would be happy if someone gives me a reference where it states that holes move in semi-conductors please.
RE: Conventional current
Why don't you try a Google search on "semiconductor holes electrons", the FIRST LINK THAT POPS UP GIVES A PRETTY GOOD EXPLANATION.
RE: Conventional current
Let's not confuse what we must do in (a) circuit analysis and (b) in physical analysis:
(a) Circuit Analysis: you will get the correct answers regardless of what convention you use, as long as you use the same one throughout your work. I always assume that current flows from + to -.
(b) Physical Analysis: the use of a convention here is not advisable, it may lead to confusion and incorrect results. It's best to determine the flow of the electrons in each case according to the laws of physics.
Michael Sidiropoulos
RE: Conventional current
I noticed in a Siemens link they have explained as follows:
Looking at a conductor with current flowing away from you, the flux is anticlockwise.
This is not how we were taught unless the teachers were ignorant. We were taught that the flux is clockwise (corkscrew rule).
Any comments.
The hole I am refering to is a positively charged atom and current flows from + to -.
RE: Conventional current
TTFN
RE: Conventional current
RE: Conventional current
Thanks