吹风机、水壶和熨斗为什么在国外风险高？

证据支持的范围

来源仅支持下列事实、插头类型或型号。型号示例不能证明整个设备类别。请核对自己的标签和实际插座。

1. Conair: 1875 W Model 303 hair dryer instructions · 核查日期: 2026-08-21

   Conair Model 303 specifies 110–125V AC, 60Hz and prohibits use with a voltage converter. PDF page 1, important safety and operating instructions. This label excludes Japan’s 100V. It does not describe every hair dryer.

2. OpenStax: Electrical Energy and Power, section 9.5 · 核查日期: 2026-09-04

   For a fixed resistive load, P = V²/R. At unchanged resistance, (230/120)² is about 3.67. Power dissipated by a resistor. An idealized calculation, not an appliance test or prediction of failure time. Real resistance, controls, motors and protection devices change the outcome.

为什么发热设备常不适合旅行变压器

高功率发热负载余量很小，容易让旅行变压器过载。