Eletricity (20point!!)

2008-12-09 9:17 pm
What is the different between Voltage and Amphere

回答 (3)

2008-12-09 9:25 pm
✔ 最佳答案
Voltage 是電壓,叫電勢差,是電池推動電子向前(+)走的力量/動力
單位是:V(伏特)
Amphere 是電流,是電子的流動,總之,有電子流動就算是有電流了(正式是-向+,但傳統是+向-)
單位是:A(安培)
都唔差在,不如講埋電阻,resistance,單位是Ohm(歐母),在串聯和parallel中都是不同的
公式如下(有關兩者的):
V=IR
P=VI
I=Q/T
R=R1+R2..
1/R=1/R1+1/R2

希望幫到你

2008-12-09 16:48:46 補充:
嗚...下面的人一個抄wiki
一個抄我的..算是什麼?

!!明明是我先答的!!!!

有冇搞錯~~
我什麼時候變左下面的人的parents!!

2008-12-09 16:50:21 補充:
不過講真,其實wiki的都不錯,可是我只是懶得去po一次
若下面的人都po左,咁我唔po啦,費士俾人話我又抄佢囉真係..
>.
參考: 自己, 自己
2008-12-10 2:55 am
當一粒帶有正電荷(CHARGE)(最外層電子數目要增加才能達到穩定)的粒子和一粒帶有負電荷(最外層電子數目要減少才能遲到穩定)的粒子接近的時侯,會產生電勢差(POTENTIAL DIFFERENT),高勢能的一方(負電荷)會把電子轉送到低勢能的一方(正電荷).這個電勢差就稱為電壓,電池有5V電壓的意思是,電池2側的電勢相差是5V,表示負電荷會用5V的電壓流向正電荷.這叫電壓.
在很久以前人們的無知,以為電子流動是由正極流向負極(事實上只有負電荷才會移動到正電荷),因此,傳統電流是由正本流向負極的.電子的流動就是電流(CURRENT),電流的方向亦是傳統電流的流動方向.
但若題目問你電子流(CUREENT FLOW)的方向,你則應該若又負極的一方流去正極的一方.
計算電壓可以用以下公式:V=E/Q,
計算電流則可用以下公式:I=Q/T.
但在會考中,大部份題目將涉及電阻,
因此將便用以下公式:
V=IR 
2008-12-09 9:36 pm
Electrical tension (or voltage after its SI unit, the volt) is the difference of electrical potential between two points of an electrical or electronic circuit, expressed in volts. It is the measurement of the potential for an electric field to cause an electric current in an electrical conductor. Depending on the difference of electrical potential it is called extra low voltage, low voltage, high voltage or extra high voltage. Specifically, voltage is equal to energy per unit charge.
In physics, the ampere (symbol: A, often informally abbreviated to amp) is the SI base unit used to measure electrical currents. The present definition, adopted by the 9th CGPM in 1948 is: "one ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed one metre apart in vacuum, would produce between these conductors a force equal to 2 × 10?7 newton per metre of length".

2008-12-09 13:37:47 補充:
Voltage 是電壓,叫電勢差,是電池推動電子向前(+)走的力量/動力
Amphere 是電流,是電子的流動,總之,有電子流動就算是有電流了
參考: my girl friend, my parents


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