In the middle circuit, the current increases and that arragement produces the brightest bulb.
What is a series connection?
A series connection involves a connection of bulbs in an end to end or a head to head manner. This implies that the resistance in the circuit increases and the current decrases.
In a parallel connection(as in the middle), the resistance decreases with the addition of each new bulb hence the current increases and that arragement produces the brightest bulb.
Learn more about series connection:https://brainly.com/question/18713901
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