What does negative voltage mean in electronics and how is it used in circuits?

Can anyone explain to me the term negative voltage ??
I'm looking online and can't find a definition.
Thanks in advance for your answer and best regards.

It is a voltage that is polarized inversely with respect to zero. If you have an alternating voltage, then there is a positive and negative part to zero throughout the period. When you "straighten" it in the right way, you will have 2 halves with different polarities. This is so for peasant reason.
If you don't understand it somewhere on the electrode I think I saw the link to the page where it is described in more detail.
YR1

it's best to take a look at the diagram of the most ordinary symmetrical power supply and you will understand ...

I see that no one answers, so you will condemn you to my, perhaps somewhat erroneous explanation .

By definition, voltage is a potential difference, that is, we do not have a voltage at a point but between two points. If we now take any of these points (A) as the reference level (ground, 0V etc.), then if the potential in another point (B) is lower than that, then the voltage between these points is negative (Uba = Vb-Va). Of course, if we take point B as our reference level, then we will have the opposite.

But as Paweł Sujko noticed this once, I have a twisted translation, so it would be good if someone would control it

The voltage is just like a colleague mentioned the potential difference between the two points. If you don't have any reference point, there is no negative voltage, we just measure the value of this voltage. Now yes - we usually take the "-" point, that is, the "minus" of the voltage source as the reference point. This is also how the meters work - the zero level equals the negative pole. Now, if you add a "plus" of a battery or other source to such a mass tip of the meter, and to the positive terminal, minus the battery, the meter will show a minus in front of the measurement value (I'm talking about digital meters).

Write or understand, because if not, we will continue to translate :)

By the way ... when I started my adventure with electronics, I was haunted by the definition of negative resistance ))

greetings
Pawel J.
greetings

Thanks - I more or less understood
It is true that I am interested in programming in assembly language and just because I needed the concept of negative voltage - because I read in the book that logical zero is -12 v and logical 1 is +12 v (e.g. in rs232)
and I was just curious ...


If you would recommend a good book (maybe an e-book) for learning electronics, I would be grateful /

It was probably about the term "NEGATIVE LOGIC", that is:
-3V to -15V is a logical "1"
+ 3V to + 15V is a logical "0"

I read the above also looking for the answer to the "definition" of the negative voltage in the computer power supply that I am going to use to power the systems at home (...) and I have a question if I would measure the voltage between the + 12v terminal and the -12v terminal, then I would have it at the output 24 v? assuming that zero DC (minus) is the reference for +12 DC and -12 DC voltages in the power supply, I think right? ...
I know, I could measure up and not ask myself what I will definitely do, but for now I have no possibility (the power supply fell into my hands by accident and now I have no physical possibility to check my thesis.)

JodaPP wrote:

if I measured the voltage between the + 12v terminal and the -12v terminal, then I would have 24v on the output? assuming that zero DC (minus) is the reference for +12 DC and -12 DC voltages in the power supply, I think right? ...

Yes. You think right, you will have 24V.