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- 世界各国用电电压介绍 - 知乎
美国电压为120V（关岛 等部分海外领地为110V），比英法都要低很多，这是因为美国最先普及电力，当时的发动机还不能产生那么大的电压。
- Voltage Differences: 110V, 120V, 220V, 240V - Build My Own Cabin
You'll often hear voltages in your home referred to as 110V, 115V, or 120V This can be confusing but the bottom line is they are referring to the exact same thing 120V is the AC voltage on a single hot wire in your home with respect to neutral (or ground)
- 为什么美国家庭电路标准电压为110V，而中国的则是220V？ - 知乎
对于美国等用120V电压的国家,电器的防护重点在于防火;而对于中国等用220V电压的国家,电器的防护重点在于触电 从理论角度来说，电压越高，线路上的损耗就越小，而电压越低越安全，如果超导体能走出实验室，我们都用12V供电就可以了。
- 110V Vs. 120V: What Is The Major Difference? - Upgraded Home
What is the real story about 110V vs 120V? In the United States, there is no difference between a 110-volt outlet and a 120-volt outlet The standard followed by power companies is to deliver electrical service to homes at 120 volts plus or minus a ten percent variance Appliances in the US market are designed to operate within these variances
- Difference Between 120V and 240V 230V AC Power Supply
The common US homes have both 120V (for lighter) and 240V (for higher load) supply voltage levels Some of the countries like Japan and Taiwan use only one level of 100V to 127V single phase AC supply
- 120 vs 208 vs 240 vs 277 vs 480: Why all the Voltages?
Both of these voltage systems can be delivered in three-phase or single-phase, however homes only require 240 120V whereas large facilities often need higher voltage (pressure) in the system for all of the lighting and equipment they have
- What is the Difference Between 120V and 240V Power?
While North American homes mostly utilize 120V power, they are connected to two live wires, not just one Normal appliances get 120V from either of the live wires, while power-heavy appliances such as Washer Dryer, Electric Stoves, Etc get 240V by using both live wires
- What Is AC 120V? - ApplianceTeacher
The “120V” represents the voltage level, which oscillates between +120V and -120V This alternating current is supplied to homes and businesses through the electrical grid, powering everyday appliances such as televisions, lamps, and microwaves
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