Post by deland # H/ B# |5 D! }: m9 L 大家都没说错,认为电阻不变的说的很对,如果你还用国内带来的灯泡的话,亮度只是原先的四分之一,这就太暗了,所以你要换这里的灯泡,认为功率不变的说的也很对,要达到原先的效果,就得换相同功率的灯泡,但导线内的电流加倍,不过不用担心,如果灯具以前在220V下没有危险的话,在110V下接相同功率的灯泡也没有危险,电压降为一半,电流加倍,导线上发热的功率还是与原先一样的.
. a& q$ ^$ J9 nYou are most right. But the last sentence is wrong. Here the power is ( h0 M' ~3 F5 M( p9 w' A) h Z
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I**2*R, not 110V*I. 4 R! Z: N+ |% Q0 `If you use the formula U*I, the U is the voltage difference between the two end points of the wire, it should be far less than 110V, otherwise the wire definately burns. ; k/ w) X# s S# w- y1 I 1 U+ L0 H9 a/ g, s z/ _3 Q/ D 6 \( ~" R7 @% T+ A导线上发热的功率 is 4 times. 9 E) e5 G( w8 P3 Y- g * R& P, ^7 E2 D6 fTo be be simplest, buy a 40W local bulb (110V), and put it on. You will get 40W, and that is it. There is no problem for the wire except the wire is very very thin.