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.)
This preview has intentionally blurred sections. Sign up to view the full version.
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
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '07
 KOPP
 Physics, YIntercept, Resistance, SEPTA Regional Rail, Jaguar Racing, University City, JenkintownWyncote, Eddie Irvine

Click to edit the document details