In a resistance also the IV graph is curve in nature? what does it mean?

with the variation of voltage applied to the light bulb current change and if we try to calculate the resistance of light bulb using V and I we get th

with the variation of voltage applied to the light bulb current change and if we try to calculate the resistance of light bulb using V and I we get the variable resistance?

or:with the variation of voltage applied to the light bulb current change and if we try to calculate the resistance of light bulb using V and I we get the variable resistance?

or:As what I have studied that iv graph is always straight line means if we increase I the v will proportionally increase uniformily

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