Difference between revisions of "TF EIMLab1 Writeup"

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|Variable ||Measured Value|| Predicted Value|| % Difference
 
|Variable ||Measured Value|| Predicted Value|| % Difference
 
|-
 
|-
| <math>V_B</math> ||  || ||  
+
| <math>V_B</math> || 103.5 mV || ||  
 
|-
 
|-
| <math>I_1</math> ||  || ||  
+
| <math>I_1</math> || 20.4 mA || ||  
 
|-
 
|-
| <math>I_2</math> ||   || ||  
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| <math>I_2</math> || 9.5 mA  || ||  
 
|-
 
|-
| <math>I_3</math> ||   || ||  
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| <math>I_3</math> || 9.0 mA  || ||  
 
|}
 
|}
  

Revision as of 22:56, 2 December 2010

Kirchoff's Law (50 pnts)

Construct the circuit below

TF EIM Lab1.png


Enter the values of the DC voltage and Resisters that you used.

Use a voltmeter to measure the potential difference and resistances.

Variable Measured Value
[math]V_A [/math] 20 Volts
[math]R_1[/math] 902 [math]\Omega[/math]
[math]R_2[/math] 10.2 [math]\Omega[/math]
[math]R_3[/math] 10.6 [math]\Omega[/math]

Enter the measured and predicted quantities in the table below

Given [math]V_A[/math] and the values of all resistors, use Kirchoff's laws to predict

a.) Predict the value of [math]V_B[/math]

b.) Predict the values of the three currents.

c.) compare your predictions and measurements by filling in the table below.

Variable Measured Value Predicted Value % Difference
[math]V_B[/math] 103.5 mV
[math]I_1[/math] 20.4 mA
[math]I_2[/math] 9.5 mA
[math]I_3[/math] 9.0 mA

Internal resistance (30 pnts)

Measure the internal resistance of your power source by graphing the potential difference on the x-axis and the current on the y-axis for several values of the resistance [math]R_L[/math] shown in the circuit below. Begin with [math]R_L = 1k\Omega[/math] and then decrease it by a factor of 5 for each subsequent measurement. You can use a volt meter to measure the current and potential difference.

Questions (20 pnts)

  1. What conservation law is involved in Kirchoff's Loop Theorem?
  2. What does the slope in the internal resistance plot above represent?


TF_EIM_LabWriteups