This screen capture, on Disk 4, is an attempt to bring a more concrete understanding to the concept of inductance. Students come to this experiment with the knowledge that the of a V/I graph is resistance and the slope of a Q/V graph is capacitance. This experiment takes a 0.5H coil and shows that the slope of an 'induced voltage against rate of change of current' graph is the value of the inductor. The software shows that the induced voltage across the coil at switch-on does not fall to zero because the coil has resistance. The software calculates this winding resistance and when the voltage is measured across the coil the volt drop across the winding resistance can be computed and hence the voltage across the pure inductor can be obtained.
You may need to scroll the screen to see both graphs. |
