The current through any branch of a network can be only single-valued.
For the situation indicated at point a in
[Fig. 1], we find by application
of
Kirchhoff's current law that the current leaving that point is greater than that entering—an impossible situation.
Fig. 1:
Therefore,
current sources of different current ratings are not connected in series,
just as
voltage sources of different voltage ratings are not connected in
parallel.
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