A circuit contains 3 bulbs in parallel. If you add 1 more bulb in series to the battery before the parallel branches, what happens to the brightness of the first 3 bulbs?
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Worked Solution
Step 1: The new bulb is in series with the whole parallel set.
Step [2-9]: Total circuit resistance increases, reducing total current.
Step [2-9]: The voltage from the battery is now shared between the new bulb and the parallel branches, leaving less for the original bulbs.
Correct answer: They become dimmer.
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