電力常識和原理

青線和火線可以掉亂用都無問題?

when the earth disconnecteed,the live wire and the neutral wire connecte inverted is no problen,as you can find the 2 plugs applainces,but if there and earth wire and RCCB,it may broke the circuit,

發熱管既原理係咩?點解青線和火線接埋可以發熱但係又唔斷路?

not these happen actually.青線和火線接埋 is short circuit.發熱管as a resistor,when voltage supplied.the current flow very very fast,heat occured.

拆開3相摩打線心尾部好像3條火線擰在一起 點解唔會撞?

because the 3 phase motor connect with Delta-Connection,The current Flow From L1,and L2 work as neutral.The current Flow From L2,and L3 work as neutral.The current Flow From L3,and L1 work as neutral.

in this case,neutral wire is omitted.and earth wire can be disconnected.
L1,L2,L3 is 220V to the neutral and earth,but in each phase(L1-L2,L2-L3,L3-L1),they have 180 degree of phase difference,so the voltage is AC380V in sinusoidal waves.

2010-03-05 00:07:35 補充：
你咩意思,吾好單單打打.

i is correct,

3-phase difference is 120 degree~ 0.0

我想問點解220v電器 青線和火線可以掉亂用都無問題?

220V單相電器設備的開關必需安裝在相線(火線),不容許安裝在中性線側,
開關必需在關(off)時,切斷帶電電壓,不依照此香港特別行政區供電條例,
輕者扣分,嚴重者如引致生命安全,可遭受刑事起訢 !

發熱管既原理係咩?點解青線和火線接埋可以發熱但係又唔斷路?
電發熱線是由 一種特殊合金(鎳 鉻? )制成,其特性可以容許強電流,
流經而產生熱能.因此可以發熱但係又唔斷路!

我拆開3相摩打線心尾部好像3條火線擰在一起 點解唔會撞?

三相摩打線圈尾部3條線擰在一起,
稱為y接,是三相摩打三組線圈的常見一種接法,
在設計的預計電流內運行,當然唔會撞!


2010-01-23 20:25:06 補充：
p,
慎言.
不容誤導讀者 !