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Elaine asked Ordinary household electric lines in North America usually operate at 120V. Why is this desirable voltage, rat?
Ordinary household electric lines in North America usually operate at 120V. Why is this desirable voltage, rather than a value considerably larger or smaller? On the other hand automobiles usually have 12V electrical systems. Why this is a desirable voltage?
And got the following answer:
Like all such decisions, it happened due to historical reasons, and quickly became too difficult to change. When Edison designed his light bulbs and his DC power distribution systems, he faced a tradeoff. Too high a voltage increased the cost of manufacturing light bulbs. Too low a voltage and the cabling for his power distribution system was too heavy. He picked 100 volts as a compromise, and added 10 volts for losses in the wiring, to get 110 volts. Later that was changed to 120 volts. Europe, when they started to electrify, was faced with a simple problem, follow the US standard or pick a new one. The equipment manufacturers picked a different voltage, 220-240 volts, so they could get a short term monopoly on power equipment. It turns out that 120 or 240 volts are both suitable for house wiring. 240 is a bit more dangerous, but uses less amount of expensive copper. 120 is safer but requires heavier wires, and copper costs. If 12 volts were used for household wiring, the wire size would be huge, you would need half inch diameter copper cables. When you add insulation and counting 3 wires, that is a huge cable, well over an inch thick. There are many hundreds of feet of cable in houses so this means a huge amount of copper. Autos, again, historical. Auto's started out with 6 volt batteries. Low voltage is better as the battery is cheaper. There is not that much high current cable in a car of that era, mainly to the starter, which is only a few feet from the battery. Later, as more and more electrical stuff was added, the battery was changed to 12 volts. Now, there is a strong movement to switch to 36 volts for the battery in autos, to save on the amount of copper in the many hundreds of cables in a modern automobile. Note that electric autos and hybrids have battery systems of about 200 volts. .
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