voltage和current

恶天使

为什么current越高voltage就越高?(不要用formula解释)
灯泡的亮度是看current还是voltage?
high current low voltage和low current high voltage哪一种电会电死人？



'为什么current越高voltage就越高'

这个不一定对，current 越高，potential difference across a component 越高，但是 energy per unit charge 还是 一样

要分清楚 electromotive force 还有 potential difference 的 分别先

[ 本帖最后由 kensai 于 22-8-2008 08:17 PM 编辑 ]

darkshiningg

原帖由 恶天使 于 21-8-2008 10:03 PM 发表
为什么current越高voltage就越高?(不要用formula解释)
灯泡的亮度是看current还是voltage?
high current low voltage和low current high voltage哪一种电会电死人？

我尝试解释。。。不明白不要shoot我哦。。
那水来比较。。。voltage就好像水压。。current就好像水的流动量。。
水压越高自然的水流量就越多。。。


灯泡的亮度是看watt的。。。current 跟 voltage都会影响到灯泡的亮度的。。。


low current high voltage会电死人。。
因为如果voltage 太低。。电流就无法流过电阻很大的人类。。

tckiat_5700

High current doesnt mean high voltage. Can be high current, low voltage or high voltage, low current. High current will kill not high voltage.

tckiat_5700

Use a simple Ohm's law V=IR,

When V=1V, R=0.1 ohm, Current I = 10A. ( Current high, voltage low )

When V=10V, R=100 ohm, Current I = 0.1A ( Low current, high voltage ).

It have to depends on your resistance R as well.

For the water pressure, high pressure of water doesnt mean there is a water flow.

Eg : There is high water pressure at deep sea, doesnt mean it must have a strong water current at deep sea.
        A shallow water sometime will produce some strong water flow or a high wave.

tkchuan

High current才会杀死人...High Voltage不代表一定high current的..

electrical consumption是看curent,current越高,就越吃电.

tckiat_5700

Electric consumption is based on total of energy used, current is only one of the factor.

Energy (J)= Power (W)x time (t)
Power = Voltage (V) x Current (I)
Energy (J) = Voltage (V)x Current (I)x time (t)

Higher voltage, higher current or longer time used will affect your electric consumption as well.

原帖由 tkchuan 于 22-8-2008 07:18 PM 发表
High current才会杀死人...High Voltage不代表一定high current的..

electrical consumption是看curent,current越高,就越吃电.

techcare4u

电鳗能电死人吗? 它的voltage和current那个high?

墨静轩

灯泡的亮度是以瓦特(w)来做标准的。。
基本上电压大不一定会死人。。要看它的电流。。
只要电流超过0.03安培(A)，就足够电死人了。。。

yuefei

可是我看过一本书，写着

如果voltage高，current低，杀不死人
如果current高，voltage低，也是杀不死人

[ 本帖最后由 yuefei 于 14-12-2008 06:14 PM 编辑 ]

天崖阁

Current is what kills but voltage is what causes the current to flow.

High current driven by a low voltage is not as apt to arc off on to a person as low current driven by a high voltage is.

You can have high voltage with zero current but you can`t have high current with zero voltage.

From this you might somehow conclude that high voltage is more dangerous than high current.