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The other day i was sitting in my room when the a bulb in the ceiling fan went out. However, i noticed that the other three bulbs in the fan were still jeeping my room lit even though one was out. this is because each bulb is wired in parallel to the power source, there fore they all receive the maximum voltage. this allows each bulb to burn as bright as possible and also allows the current to bypass the broken bulb and flow to the three remaining ones. this wonder of parallel circuits however is seen in my family's electric bill because the lights take more energy to run. Also i noticed a different kind of circuits in my desk lamp which has three light bulbs each of different brightness. in this lamp if one bulb goes out they all go out because the bulbs are wired in series and therefore when one bulb is burnt out the path for the electrons is broken and thus no current is received by any of the bulbs.