Question

What is the nature (i.e. positive or negative) of the slop of the voltage vs. Resistance characteristics ofTungsten Filament Lamp? Explain it briefly.​

Answer 1

Answer:

It’s going to be nonlinear. Because the tungsten filament has a large temperature coefficient; that means it increases resistance as the filament heats up. At room temperature, with a low voltage ohmeter it will measure ten ohms, maybe less. As the voltage is increased and everything stabilizes (the filament is very low thermal mass so it settles very quickly) the resistance may be well over 100 ohms. The plot of I vs V tries to flatten out as it goes higher.

Explanation:

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