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Lab 8
1.)
2.) The slope of this line is 2.2996x meaning the internal resistance of the battery is 2.2996
.
Ω
3.) The EMF of the battery is 1.2248 V which was found by obtaining the y intercept of the
V vs. I graph. If I = 0 then the EMF would equal the y intercept of the graph.
4.)
(
│
E E’
│
/ E’) x 100%
E = 1.19 v
E’= 1.2248 v
(
│
1.19 v 1.2248 v
│
/ 1.2248’) X 100% = 2.48% error
This shows that the EMF and the open circuit voltages of the battery are very close to each
other.
8.1.2
1.)
V= E – Ir
V = 4.11 v
E= 4.35 v
I = 90 mA = 0.09 A
4.11= 4.35 – .09r
r = 2.67
Ω
This is the combined resistance of the three batteries.
2.)
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View Full DocumentE1 = 1.49 v
E2 = 1.36 v
E3 = 1.47 v
E1 + E2 + E3 = E’
1.49v + 1.36 v + 1.47 v = 4.32 v
Combined EMF (E’) for the three batteries is 4.32 v.
3.)
(
│
E – E’
│
/ E’) x 100%
(
│
4.35 v – 4.32 v
│
/ 4.32 v) x 100% = 0.69% error
4.)
r = 2.67 Ω
r = r1 + r2 + r3 where r1 = r2 = r3
2.67Ω / 3 = 0.890 Ω
If the resistances are equal across each battery then each battery would have an internal
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 Spring '07
 KOPP
 Physics, Resistance

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