how are christmas tree lights wired

Christmas tree lights are typically wired in series, which means that the electricity flows through each bulb in a straight line from the first bulb to the last bulb. Each bulb is connected to the next in a chain, so if one bulb fails, the entire string of lights will fail. However, some newer Christmas tree lights are wired in parallel, which means that each bulb has its own independent path to the power source, so if one bulb fails, the other bulbs will still work.