State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
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The resistance of the filament increases, when a bulb glows as the temperature of the filament increases.
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State Ohm's law.
How are the potential difference (V), current (I) and resistance (R) related?
What do you understand by the term resistance?
How is the current flowing in a conductor changed if the resistance of conductor is doubled keeping the potential difference across it the same?