lab 8 physics

# lab 8 physics - L ab 8 1 2 The slope of this line...

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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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E1 = 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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lab 8 physics - L ab 8 1 2 The slope of this line...

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