(b) Figure 1: question-3 4. Suppose you apply variable voltage across an incande

Question

(b) Figure 1: question-3 4. Suppose you apply variable voltage across an incandescent, bulb , and due to the current the bulb glows. Now you very slowly increases the voltage and wait few minutes and measure the current flowing through the bulb gradually . If you plot V(applied ) vs I (current) , will it follow OHM'S LAW (i.e : The graph will be linear)? ( a) Graph will be linear for all voltage applied across the bulb (b) It will not be linear, and will not follow OHM'S law for higher voltage applied

Explanation / Answer

AS we gradually increase the voltage, the current in the bulb will also increase ( bulb will glow brighter )
But ,after a while for some particular value of voltage, the current would be maximum and then any further increase in voltage
will lead to blowing of bulb( ie bulb will get fused).
So we can clearly understand that graph will be linear till certain value of voltage only and not for all values of voltage.

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