# Flow of current DC Circuit Neg to Positive

#### ben sorenson

Joined Feb 28, 2022
180
Just wondering what the significance / usefulness would be if (if any) hypothetically in a DC circuit e.g from a 20 volts battery. If instead of current flowing from positive to negative, the circuit was able to run from negative to positive. Silly question

#### BobTPH

Joined Jun 5, 2013
8,684
It does, when you he battery is charging.

#### dl324

Joined Mar 30, 2015
16,732
If instead of current flowing from positive to negative, the circuit was able to run from negative to positive.
Conventional current flows from positive to negative. Electron current flows the opposite direction.
Silly question
I think most schools now teach conventional current flow. There are a few screwballs who insist on using electron current, but they just cause confusion.

#### crutschow

Joined Mar 14, 2008
34,066
There are a few screwballs who insist on using electron current
Those that want to understand how vacuum tubes work.
It's a little difficult to explain using conventional current flow.
You'd have to say that the positive charges are attracted to the heated cathode.

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#### ben sorenson

Joined Feb 28, 2022
180
I guess what Im asking is what would the significance be if you could run a Battery powered DC circuit "backwards". Simple Example: Positive Side of LED/MOFSET/Transistor (No capacitors) connected to Negative side of Battery and Negative side of those components to positive. Just hypothetically for pretend if it was possible would there be any benifit if a circuit could run like that? And of it did, what would that mean?

#### BobTPH

Joined Jun 5, 2013
8,684
So you are asking what happens if you connect an LED backwards to a battery? If the voltage and current capacity are large enough he LED will be destroyed.

Bob

#### Wendy

Joined Mar 24, 2008
23,396
In batteries there are positive charge carriers, but since electrons are negative I prefer negative current flow. Chemistry opens up a can of worms. When you are talking about charge carriers.

Joined Jul 18, 2013
28,529
There are a few screwballs who insist on using electron current, but they just cause confusion.
Per @crutschow comment, I came up through the valve age so it would have been hard to learn it as per Benjamin Franklin!
,

#### nsaspook

Joined Aug 27, 2009
12,846
Those screwballs include most of the military electronics technicians since the 1940's. It's just a convention. For mathematical computation in circuit theory, conventional (Conventional current is defined as the Superset of all charge carrier flow directions and is non-physical) current eliminated the need for negation in several cases. Circuit theory computations work exactly the same either way (to calculate electrical engineering answers, not to answer physics questions on things like electrician energy flow) so understand both and use both when the physical nature of charge carrier movement is important like electrons/ions in tubes/batteries and back to conventional with solid-state in the same circuit.

https://www.nutsvolts.com/magazine/article/which-way-does-current-really-flow

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#### Wendy

Joined Mar 24, 2008
23,396
I find it interesting how this subject seems to come up every so often.

#### Wendy

Joined Mar 24, 2008
23,396
Like it or no, the majority of electronics is about electrons.

#### nsaspook

Joined Aug 27, 2009
12,846
Like it or no, the majority of electronics is about electrons.
Yes, but knowing that tells you nothing about electronics, only about atoms. I deal with electrons, and sub-atomic particle interactions daily to make a small part of the electronics people here use. The majority of electronics is about energy and the transformation of energy using the geometry of charges. It's not the actual clay (electrons) that is important in the vast majority of circuits, it's the components build with electron manipulation in them that matter.

#### BobTPH

Joined Jun 5, 2013
8,684
I don’t think the OP has anything to do with current sign conventions. I think he’s is asking what happens if you push current backwards through a circuit.

#### crutschow

Joined Mar 14, 2008
34,066
I guess what Im asking is what would the significance be if you could run a Battery powered DC circuit "backwards".
You question really makes little sense.
The circuit simply would not work, theoretically or in reality.

#### nsaspook

Joined Aug 27, 2009
12,846

Always build the alien device on another planet.

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