220v is less wasteful since it uses less current power. In other words, it utilizes fewer amps to generate power, while 110v needs more amps to produce the same power. However, the high voltage level in 220v entails a greater risk of electrical shock. 110v has a lower voltage, consequently, lower risk of this, but it isn’t efficient as it requires larger gauges to flow the current. Yet when it comes to home appliance manufacturers, efficiency is not as important as safety.
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