Countries that use 110V generally consider low voltage relatively safe, so they use lower voltages for household electricity. Just because 110V is lower than 220V doesn't mean it's definitely safe. This voltage also exceeds the safe voltage of the human body.

When working at low voltage, appliances with the same power have higher current, especially high-power appliances such as electric heating appliances and air conditioners. The disadvantage here is to use low pressure operation. In addition to the higher currents that the power cord must withstand, the steering components inside the device also require higher steering currents. From this point, compare low-voltage power supplies with high-voltage power supplies. more lossy.

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