Walt and Coloken are correct. A watt is the same no matter if it's 120V or 240V. Amperage changes when voltage changes. That's why we pay for electricity with a watt/hour meter and not an ammeter. If we used an ammeter, and the voltage dropped a little like during a period of high demand, the amps would be lower so the user would be charged less than if paying by the number of watts. An easy example is a 6V tractor vs a 12V tractor. The 6V tractor uses half the volts of the 12V tractor, so all things being the same, (engine size electrical loads) the 6V tractor will require twice the amps to start the engine and light the lights. Since twice the amps are required, much heavier wire is needed to carry the extra amperage. This same reasoning applies to why more and more functions on a new car are computer controlled. If every function were directly controlled by each switch, the wiring harness would be tremendously heavy. By using tiny amounts of current that a module can recognize, the same functions can be accomplished, plus some that were not possible with old technology, with considerably less raw material. Less raw material, less weight, less cost.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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