Further, if E is the magnitude of uniform electric field in the
conductor whose length is l, then the potential difference V across its
ends is El Using these, the last equation reads
GEORG SIMON OHM (1787–1854)
Georg Simon Ohm  (1787–
1854) German physicist,
professor at Munich Ohm
was led to his law by an
analogy 
between 
the
conduction of heat: the
electric field is analogous to
the temperature gradient,
and the electric current is
analogous to the heat flow Rationalised 2023-24
Current
Electricity
85
        E l = j r l
or,    E = j r
(3