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Ohm's Law

A car bulb co...

Question

A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more, same or less when the blb is not glowing?

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Solution

When the bulb is not glowing, resistance is less. This is because resistance decreases with a decrease in temperature.

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