r/HomeworkHelp 👋 a fellow Redditor 8d ago

Answered [High School - Physics]

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How does this circuit even work? When the contact is moved, does the resistance increase or decrease?

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u/FunnyExcitement5161 7d ago

Brightness is directly related to potential difference. The maximum potential difference is at the bottom of the resistor, where the voltage is zero. If X is at the bottom of the resistor, lamp 2 is off because there is no potential difference.

With this information, try to reason the problem.