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Post by deland * f% Z, u; x) d! ~2 g
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.
* K8 d* t# S0 \$ V, Z# _% ~0 |You are most right. But the last sentence is wrong. Here the power is
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I**2*R, not 110V*I.
: P* V9 X# t- {8 _4 yIf 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& {! A5 b' H* W* G- x6 g3 D: E, E
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导线上发热的功率 is 4 times.2 [, X1 o5 o, q2 b9 b1 U8 h6 |& t
/ t5 R& Y: ~% X% Y: |8 n) H" o$ _; uTo 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. |
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