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7.4.1
1.
I = V/R
I = 12 V / (R1 + R2 + R3)
I = 12 V / ( 104.8 Ω + 209.1 Ω + 310.2 Ω)
I = 12 V / 624.1 Ω
I = .019 A
I = 19 mA
V1 = I x R1
V1 = .019 A x 104.8 Ω
V1 = 1.99 V
V2 = I x R2
V2 = .019 A x 209.1 Ω
V2 = 3.97 v
V3 = I x R3
V3 = .019 A x 310.2 Ω
V3= 5.89 V
2.
(│I – I’│/ I) X 100%
I = 20.0 mA
±
5 mA
I’ = 19.0 mA
(│20.0 mA – 19.0 mA│/ 20.0 mA) X 100% = 5% error
Our error was minimal because our measured value was very close to our calculated value for the
current. This shows that the current is an inverse relationship of Voltage and the combined
resistance.
(│V1 – V1’│/ V1) X 100%
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View Full Document V1 = 1.98 V
V1’= 1.99 V
(│1.98 – 1.99’│/ 1.98) X 100% = 00.5% Error
Our error was very small because our calculated value was very close to our measured values.
This applies to all three measurements of Voltage in this circuit.
(│V2 – V2’│/ V2) X 100%
V2 = 3.97 V
V2’= 3.97 V
(│3.97 – 3.97│/ 3.97) X 100% = 0% error
(│V3 – V3’│/ V3) X 100%
V3 = 5.91 V
V3’= 5.89V
(│5.91 – 5.89│/ 5.91) X 100% = 00.3% error
3.
(│R – (R1 + R2 + R3│)
/ (R1 + R2 + R3)
R= 624 Ω
(│624
– (104.8 + 209.1 + 310.2)│)
/ (104.8 + 209.1 + 310.2) X 100% = 00.02%
The error of our measurements is almost nonexistent. This proves that the measured total
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This note was uploaded on 01/25/2011 for the course PHY 317k taught by Professor Kopp during the Spring '07 term at University of Texas at Austin.
 Spring '07
 KOPP
 Physics

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