sci.physics.electromag

Uzytkownik "Benj"
>
> The question is nonsense!

I have found the proper citation:

"The present state of the art of potential measurement consists of the
comparison of two potential sources by observing the voltage difference
between them and assuming that one of them is of either an arbitarily
assigned zero or non-zero value. This provides knowledge of a gradient or
voltage difference without knowledge of the true or absolute potential of
either source. Earth ground is often considered as reference zero for
convenience, a convention that dates back to the earliest days of electrical
science. Mathematically, electrical potential is defined as the work
required to bring a unit of charge from infinity to the location of that
potential without disturbing its value. Although infinity is defined as zero
potential, the earth is considered a more convenient local zero potential
reference by common convention. It can be shown, however, that the absolute
potential of the earth is not zero."

It is from: /

It seams that the absolute potential of the earth ground is known. But I
could not find it.
So I think that such task would be interesting for students.
S*