Lab 1 TF EIM

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Kirchoff's Law

Construct the circuit below.

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

Variable Measured Value

Enter the measured and predicted quantities in the table below

Use Kirchoff's laws to predict the current values and compare them to your measurements by filling in the table below.

Variable Measured Value Predicted Value % Difference

Internal resistance

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 R_L = 1k\Omega 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.