One can excite electrons with a thousand volts from a cattle prod, but the starter won't spin. Power is measured in watts. Watts is volts times amps. 200 amps at 11 volts while starting gives 2200 watts. So a 12v battery develops enough work effort to spin it well. At 5.5 volts cranking a 6v system to 400 amps, the watts is 2200. Because lower voltages require higher amps, they loose more in motor efficiency and wire resistance losses. 6v batteries have thicker plates, and are subject to the same internal resistance issues. Look at the trend in battery powered hand tools. from the 12 volt tools years ago, we now can find 60 volt battery driven powerhouses. It is delivered energy that makes watts turn starters. Voltage provides that force, through small resistances (way less than an ohm on both 6 and 12v starters) to drive amps making watts. Jim
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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