Circuit Prediction and Verification · RMPH 2014 #3
Physics · electromagnetism
Problem
This experimental problem proposes an analysis for an electrical black box, which has three terminals - denoted by 1,2,3. Based on the equivalent circuit determined from previous analysis of experimental data, you need to make predictions for a new terminal configuration.
The experimental data from three different terminal configurations were:
Table 1 (terminals 1,2,P connected; terminals 3,Q connected):
| U(V) | -6 | -4 | -2 | 0 | 2 | 4 |
| I(A) | -0.2 | 1.2 | 2.6 | 4.0 | 5.4 | 6.8 |
Table 2 (terminals 2,3,P connected; terminals 1,Q connected):
| U(V) | 0 | 2 | 4 | 6 | 8 | 10 |
| I(A) | -5.2 | -4.0 | -2.8 | -1.6 | -0.4 | +0.8 |
Table 3 (terminals 3,1,P connected; terminals 2,Q connected):
| U(V) | -6 | -4 | -2 | 0 | 2 |
| I(A) | -0.6 | 0 | 0.6 | 1.2 | 1.8 |
Assume that all current-voltage dependencies are linear.
Task 3
3.a. For the equivalent circuit that you have determined in the task no. 2, plot the current-voltage dependence, when the terminals P and Q are in electrical contact with terminals 1 and 2 respectively. Write numerical values of the intersections with the axes of coordinates of the graph plotted.