In the lab you tested a simple circuit made of a battery connected to a light bu

Question

In the lab you tested a simple circuit made of a battery connected to a light bulb

How do you explain a spike in the current for a brief period of time after the switch connecting light bulb to the battery was closed?

A.) Light bulb filament acts as a large inductance and produces a large emf opposing the voltage change from the battery after the switch is closed

B.) Light bulb obeys the Ohm's law only after the current settles into a steady state and the resistance of the light bulb decreases

C.) Light bulb filament has significant capacitance which draws a lot of current from the battery until it is fully charged

D.) Light bulb has some electric charge stored in it from being previously connected to a battery so it takes a short transient time for these charges to drain from the bulb

E.) Light bulb does not obey the Ohm's law and as the current settles into a steady state the resistance of the light bulb increases

Explanation / Answer

Option E is correct

Light bulb is a non ohmic conductor.So it does not obey the Ohm's law and as the current settles into a steady state the resistance of the light bulb increases

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