Each light bulb uses up a little power. If you wire each bulb individually back to the battery (parallel) they each get full power. You can smash one and it has no effect on the other.
If you wire them in series - they're in a chain , each bulb using a little power from what's available in the chain (circuit), leaving less power available for any other bulbs in the circuit.
In this case, that's a desirable effect. Each of the 6v bulbs were designed to work with less power. With a 12v battery, you don't want full power flowing through them or they'll burn up. So having them in series, each one uses enough power to lower the overall power available to the other. They both live happily at reduced power.
But - if one burns out the circuit is broken, and the other stops working. That's the downside.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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