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V. Lindberg>A linear I-V plot does not make a resistor. An I V plot
of a battery
is linear (at least for small current draws) but it is not a
resistor. For a resistor, the graph must be proportional, linear
with no intercept.
I wish texts would make clear that "internal resistance" of a battery
is a dynamic resistance, and that this model of a battery only works
for limited amounts of current drawn from the battery.
The internal resistance r of a battery is not a dynamic resistance. It
is a model parameter that yields the approximate potential difference
V across a battery rated at E emf when current I is drawn from it:
V = E - Ir
Leigh