
597Energy Storage
© 2008 Taylor & Francis Group, LLC
The current ow through a 3 Ω external resistance is
I
E
=
+
=
+
=
3 825
and the voltage is
o
== =(. )( ).3 825 3115AVΩ
The voltage vs. current characteristics for the simplied model are shown in Figure 10.13.
The linear model is useful, but represents real battery characteristics only qualitatively.
Real batteries can provide current and power to a wide range of resistances with little volt-
age drop, but only for short periods of time. The linear model fails for longer periods of
time and when large currents are drawn because it does not account for the nite amount
of stored chemical ...