但是反過來呢?
網上這樣說:
If a 220V appliance is plugged into 120V then it will be less dramatic but the power drawn will be 1/4th or the intended amount and the lights will be very dim and the motors will stall or turn very slowly. If they stall it may up the current some but in general it won't work well if at all. Cooking equipment with heater elements will take forever and may not come up to temperature. Electronics with single inputs will probably not be seriously damaged but won't work.
我自己的試驗是從中國帶來一個節能燈泡,220伏,用在110伏美國環境,可以發光,但是比較昏暗。
明顯不妥,存在隱患。甚至有人認為,即使用變壓器也不應該長時間使用,因為變壓器會發熱,有安全隱患。
不應該在美國的110伏電壓下用中國的220伏電器。
至於電腦,照相機,手機等電子產品幾乎是百分之百的100-240伏自動電壓,完全沒有關係。