Post by deland 8 ^# }# ]+ Y; n8 Z
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.
4 ]2 U/ E6 ?% x; r+ n) ^4 CYou are most right. But the last sentence is wrong. Here the power is & l8 t# z7 _6 w) B4 @& |9 G4 T3 ^ * z" g( X& |0 D- b$ }
I**2*R, not 110V*I. ' e) P. H0 P* Q. D9 w
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.( {6 X3 H; C6 U# L# P7 s
d Y6 E6 @. i" Z 2 w7 R" q `6 _ O9 F x导线上发热的功率 is 4 times. # q) S1 q( O/ V+ F4 r0 | + k9 r: H# L# K* P$ xTo 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.