Physics and History of Why USA uses 120 volts and not 220 volts

Why do 1/3 of the countries in the world use around 110 volts and the other 2/3rds use around 220 volts? I go through the history and the physics to explain why it is so confusing.

Links:
My mailing list:
https://kathylovesphysics.ck.page/wel...

My Patreon Page:
https://www.patreon.com/user?u=15291200

As usual, a big thank you to the fabulous Kim Nalley for singing "electricity" and some background music. www.kimnalley.com

Song: Overture/And All That Jazz
Artist: Catherine Zeta-Jones;Taye Diggs;Renée Zellweger
Licensed to YouTube by
SME (on behalf of Epic); UNIAO BRASILEIRA DE EDITORAS DE MUSICA - UBEM, PEDL, LatinAutor - Warner Chappell, CMRRA, ARESA, BMG Rights Management (US), LLC, Warner Chappell, LatinAutorPerf, BMI - Broadcast Music Inc., and 11 Music Rights Societies

• #education
• #different_county_voltage
• #history_of_electricity
• #why_us_uses_120_volts