What are the difference between series and parallel conection in physics?

In a series circuit, each bulb is placed on the same side of the wire, resulting in a gradual dim of each bulb, as the energy the voltage holds decreases after it goes through each bulb. In a parallel circuit however, the voltage maintains the same amount, leading to all bulbs having the same brightness.

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they can be connected in series or connected in parallel.

Explanation:nothing

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