Question 4. Hypothesize as to why the data is linear at low voltages/currents, a

Question

Question 4. Hypothesize as to why the data is linear at low voltages/currents, and then deviates at higher values. (Hint: our eyes tell us that the light intensity is higher for these higher voltages/currents. Assuming the temperature of the bulb filament corresponds to the light intensity, what can we say about the how the resistance of the filament changes with temperature? A simple qualitative answer is all that is sought here.)

Question 5. The heating of the filament is what causes the light production (photon emission), and heating is caused by the current in the light bulb. Why isn’t it a good idea to drive light bulbs using constant current sources rather than constant voltage? (Hint: think about the answer to Question 4).

Explanation / Answer

I think that the data is linear at low voltages/ currents and then deviates at higher values is because of the change of the temperature is faster than the change of the resistance of the filament, which it corresponds to the light intensity. As the light intensity drives so high, the voltages and currents will also increase hugely.

It is not a good idea to drive light bulbs using constant sources because this can lead to either the short circuit of the filament or very low resistance of the filament, ultimately causing it to fuse without functioning properly. Hence, light bulbs must be driven through constant voltage.

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