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 - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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