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If you ever flown at night, you would have seen these bright lights and signs on the runway, directing the pilots to their correct paths and destinations.  Unlike the lights in our homes and offices, these lights are wired in series, not in parallel.  Each light is powered through an isolation transformer, so that if one light bulb goes out, the string does not go down, like the common Christmas lights which are also wired in series.  This series structure assures the same current ...

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