Question

Please answer ALL questions below with complete equations and full explanations. Thank you very much for your help!!!

3. The graph for alight bulb is not symmetric, it exhibits hysteresis. Why is V/I different when the filament is heating up compared to the when the filament is cooling down?

4. Observing a plot of I versus V for a bi-color diode, it should be obvious how the two diodes are wired together. Draw this wiring diagram for the bi-color diode for the different possible wiring configurations.

5. If you used a multimeter to measure the resistance of a red diode, what would the multimeter read? Explain

Answer 1

3.

tarting from cool you apply a current..at the beginning of the trace there is relatively little resistance and the filament glows dull red,milliseconds later the temperature of the filament increases and raises the Resistance until it reaches the maximum brightness of white...In other words the inrush of current is in inverse proportion to the resistance (limited by heat)..now when the current is removed there is no parabolic ramp to tangency there is only a linear drop to zero,even while the filament is still white hot (a residual effect) no current is flowing..Another point to make here is the relationship you noticed here holds true for practically all loads .when the power is removed there is no residual current to contend with only a ramp down from heat which of course is as linear as the ambient temperature will allow.