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In a series connection, the bulbs are connected end-to-end with each other. The advantage of connecting bulbs in series is that it is easier to set up because only one current path is formed and less wiring is needed. However, there are several disadvantages. Disadvantages: 1. If one bulb goes out, all the bulbs in the series connection will go out as well. 2. The overall resistance in the series connection increases with the addition of each bulb, resulting in a decrease in current and, therefore, in the brightness of the bulbs. 3. The overall voltage across the bulbs must be the sum of the voltage drops across the bulbs, so higher voltage power sources are needed for series connected bulbs.

In a parallel connection, each bulb is connected to the power source independently, and multiple current paths exist. The main advantage of connecting bulbs in parallel is that each bulb receives the same voltage from the power source, allowing them to emit the same brightness. Additionally, if one bulb goes out, the other bulbs will still function normally. Disadvantages: 1. Since the bulbs operate at the same voltage, this connection requires more wiring and a more complex setup. 2. The overall current from the power supply must be higher in parallel connection because each bulb draws its full share of current, which could lead to a higher energy consumption. In conclusion, a series connection is simpler and requires less wiring, but the brightness of the bulbs diminishes as more bulbs are added, and if one bulb fails, all will go out. On the other hand, a parallel connection allows bulbs to have uniform brightness, prevents other bulbs from going out if one fails, but requires a more complex setup and could consume more energy. The choice between connecting bulbs in series or parallel should be informed by these advantages and disadvantages.