Kirchoff's Law
Construct the circuit below.
Enter the values of the DC voltage and Resisters that you used.
| Variable |
Measured Value
|
| [math]V_{ab}[/math] |
|
| [math]R_1[/math] |
|
| [math]R_2[/math] |
|
| [math]R_3[/math] |
|
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
|
| [math]I_1[/math] |
|
|
|
| [math]I_2[/math] |
|
|
|
| [math]I_3[/math] |
|
|
|
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 [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.