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How does the resistance of a filament lamp change as the voltage increases?
The resistance of a filament lamp also increases when the potential difference increases as it makes the filament red hot.
The electron movement makes the kinetic energy of atoms of the filament oscillate faster and heats up the filament.
During this process, it’s very difficult for the electrons to find a passage through the filament due to the high kinetic energy of the atoms, and the resistance increases.
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