We started using electric chairs because Thomas Edison was desperately trying to make his DC power dominate (completely impractical) over AC power, so he would set up demonstrations of killing old circus and zoo animals with Tesla’s AC system. Even demonstration of it on a convict. It actually backfired on him because all people remembered was EDISON and the shocking death of some poor creature, especially the last one, an elephant.
NY kept the chair Edison provided and continued to use it.
DC is totally impractical for delivery of electricity to consumers as it requires a separate pair of wires to each user. There are photographs of some streets with hundreds of wires on poles for just one block, and you would need a power generator within blocks.
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