. In class we mentioned the idea of internal resistance of a battery. Ideally, for a perfect battery one would have AV = E, the electromotive force. In reality, every battery have a small but nonzero internal resistance r which means the actual potential difference across the battery is not constant, and may sometimes be significantly different than what it is rated for. ^^^||1|* and the current is given by 3 {R (a) Show that the potential difference across the battery is AV = E-ir i = load E r+Rload (b) If r = 10, plot AV versus Rload- (c) Given the above, explain why sometimes we don't care about the internal resis- tance. (d) Let & = 1.53V, and the measured voltage and current across a 15.60 load is respectively 1.49V and 96mA, what is the internal resistance?

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6. In class we mentioned the idea of internal resistance of a battery. Ideally, for a perfect
battery one would have AV = E, the electromotive force. In reality, every battery have
a small but nonzero internal resistance r which means the actual potential difference
across the battery is not constant, and may sometimes be significantly different than
what it is rated for.
and the current is given by
WM|1|*
3
(a) Show that the potential difference across the battery is
AV = E - ir
=
`load
i =
E
r+Rload
(b) If r = 10, plot AV versus Rload-
(c) Given the above, explain why sometimes we don't care about the internal resis-
tance.
(d) Let E
1.53V, and the measured voltage and current across a 15.60 load is
respectively 1.49V and 96mA, what is the internal resistance?
Transcribed Image Text:6. In class we mentioned the idea of internal resistance of a battery. Ideally, for a perfect battery one would have AV = E, the electromotive force. In reality, every battery have a small but nonzero internal resistance r which means the actual potential difference across the battery is not constant, and may sometimes be significantly different than what it is rated for. and the current is given by WM|1|* 3 (a) Show that the potential difference across the battery is AV = E - ir = `load i = E r+Rload (b) If r = 10, plot AV versus Rload- (c) Given the above, explain why sometimes we don't care about the internal resis- tance. (d) Let E 1.53V, and the measured voltage and current across a 15.60 load is respectively 1.49V and 96mA, what is the internal resistance?
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