Star AI | Navigate the Stars of AI on Instagram: "A Special Electric Device from 102 Years Ago! This is called a Mercury arc rectifier, and it was found inside a really old elevator that's over 100 years old! What does it do? This device changes electricity from one type to another. There are two types of electricity: AC (Alternating Current) - electricity that switches direction back and forth, like the power in your house DC (Direct Current) - electricity that flows in only one direction, like