
64 Fuel Cells
In an electrical system such as in an electrochemical fuel cell, the electri-
cal work is done as a result of the ow of electron across the system bound-
ary through an electrical load circuit under the effect of an electromagnetic
potential difference. When N electrical charges ow through an external
load circuit owing to the electromagnetic potential difference E, electrical
work is given as
δW
e
= NE. (3.7)
The number of electrical charge moving through an electrical circuit is the
current owing over time, dt, and given as
N = i dt. (3.8)
Combining Equations 3.7 and 3.8, we have
δW
e
= iE dt (3.9)
and for a process with cha