Re:MDN converted to Markdown
by kragen on Saturday November 05, 2022 @02:32PM
(#33484259)
DC needs a substantially higher voltage to kill you than AC. You can hold 100VDC wires in your fingers and be fine, though if you try this, I strongly recommend doing it with the other hand in your pocket and no path to ground, in case your hand is sweatier than average.
The lower danger of transmission lines is less important once you're committed to stepping voltages up and down, because HVDC transmission lines can still kill you, and there's no real reason we couldn't be using 48VAC inside our houses instead of 120VAC or 240VAC, which would be a lot safer. Historically, though, AC came as a package with transformers and higher-voltage transmission/distribution to substations, and without such super low voltages in houses.
You're exaggerating the technical advantage of AC by a couple of orders of magnitude; you can reasonably transmit 100VDC power about a kilometer, and Edison did, so it's a generator on every 314 city blocks or so.
The lower danger of transmission lines is less important once you're committed to stepping voltages up and down, because HVDC transmission lines can still kill you, and there's no real reason we couldn't be using 48VAC inside our houses instead of 120VAC or 240VAC, which would be a lot safer. Historically, though, AC came as a package with transformers and higher-voltage transmission/distribution to substations, and without such super low voltages in houses.
You're exaggerating the technical advantage of AC by a couple of orders of magnitude; you can reasonably transmit 100VDC power about a kilometer, and Edison did, so it's a generator on every 314 city blocks or so.