Question

A bulb can not be used in place of a resistor to Verify Ohm's law. Justify this statement with reason ?

Answer 1

the current flowing through the bulb causes the temp. and therefore the resistance of its tungsten filament to change during the experiment .

we know that one of the essential condition of ohm's law is that a changing temp. must not allowed to affect the resistance of the load . it mean in this case of using bulb in the place of   resistor the ratio of voltage to current varies continuously throughout the experiment .therefore tungsten (hence bulb) does not verify ohm's law ..

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