Ludwik,
Your first short essay is a well-put together presentation of a traditional
approach to initial understanding of basic ideas of electricity and
magnetism.
It is much superior to what is sometimes seen: symbols given for electric
current, electric potential and electric resistance, a statement of Ohm's
law and a clutch of "problems" where students are expected to plug numbers.
However, your approach does not get to grips with fundamenetal questions
such as:
what are the charges that create the electric field in the wire which makes
current flow?
how does a battery know how much current it should send out?
I draw your attention and that of others on the list to the minimalist
approach used by Chabey and Sherwood in, for example, their text Electric
and Magnetic Interactions, John Wiley, 1995.
BTW in their approach, although Electric Currents is the title of Chapter 5
and the resolution of the question about the charges that create the field
is in Chapter 6, potential is not treated until Chapter 8 and power not
until the middle of Chapter 9, soon after resistance! Not surprisingly,
they see no need to refer to energy as an "invisible fluid".