Why Does America Use 120 Volts?

By History of Simple Things

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Why are American power outlets 120 volts when many countries use 220 or 230 volts? The number 120 may seem random, but it comes from the early history of electrical power in the United States. In this video, we explore how early electrical systems, Thomas Edison’s 110-volt systems, alternating current, and decades of infrastructure helped shape the 120-volt standard used in American homes today. We’ll also look at the fascinating 120/240-volt split-phase system found in many U.S. homes—and why changing the voltage standard today would be far more complicated than simply replacing a few outlets. ⏱️ TIMESTAMPS 0:03 — Why 120 Volts? 0:49 — The Early Days of American Electricity 1:48 — Edison and the 110-Volt System 2:46 — How 110 Volts Became 120 Volts 4:05 — Why America Didn't Switch to 230 Volts 5:01 — The 120/240-Volt System Explained 6:00 — Why American Outlets Look Different 6:57 — Why the Standard Still Exists Today 7:43 — The Real Reason Behind 120 Volts If you enjoy discovering

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