The Mechanical Universe is no spring chicken. It was born in the mid-1980s.
I recently stumbled across this old gem on YouTube. As a fan of Atomic Café, I've got a soft spot for post-WWII-era animation. It's not a vision of gender equity, and the scientific models aren't flawless, but it's tasty nostalgia, tinged with that proud, declarative optimism for "Tomorrow's World." And Mr. Electron is as cute as Casper.
Principles of Electricity part 1 (1945)
Principles of Electricity part 2 (1945)