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The US uses 120v AC because incandescent light bulbs and heaters that ran at 100v DC would work at 120v AC. It allowed upgrading the original DC grids to AC wit
by gwbas1c 6y ago
The US uses 120v AC because incandescent light bulbs and heaters that ran at 100v DC would work at 120v AC. It allowed upgrading the original DC grids to AC with minimal impact.