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標題: 救命呀~!好多野唔識呀@@||| [打印本頁]

作者: dolphin_ice 時間: 19/6/2005 12:16 AM
標題: 救命呀~!好多野唔識呀@@|||
死啦﹐星期3考physics咁ge款@@|||
-----------------------------------------------------
1. 咩叫short circuit? 點解唔好? 有咩效果?

2.Transistor係做咩ga? base 同common又有咩用?

3. 點解circuit入面Voltage increase, Current Increase; 但係transporting electricity果時Voltage increase, Current Decrease?

4. Circuit個Charge同Stactic個Charge係1樣定唔同? If唔同﹐有咩唔同?

5. Earth Wire 點解可以防shock? 唔比你掂中Earthwire同LiveWire之間ga?

[ Last edited by 紅唇娃 on 2005-6-19 at 12:20 AM ]

作者: 細薯 時間: 19/6/2005 11:15 AM
electricity 嗎．．．
未教．．
Form 5 先教．．
(ar Sir 話難好多．．>__<)

作者: davidng26 時間: 19/6/2005 01:24 PM
我form 2教左1,5...
仲要聽日考試=.=
1)short circuit 係因為d電正行走一條非預定路線(例:電器外殼...)
[電制-->電線-->電器外殼--->電線-->電制]
由於冇左用電器本身的resistant,所以(cirrent)[<--點串=.=]就會增加
以致電線外層燒熔而漏電..............
5)earth wire 係連接住電器外殼的...
可令short circuit 時d電flows 去earth wire
以免人接觸到電器外殼時觸電
終於寫完=.=

[ Last edited by davidng26 on 2005-6-19 at 01:25 PM ]

作者: jbano2 時間: 19/6/2005 06:29 PM
死啦﹐星期3考physics咁ge款@@|||
-----------------------------------------------------
1. 咩叫short circuit? 點解唔好? 有咩效果?

2.Transistor係做咩ga? base 同又有咩用?

3. 點解circuit入面Voltage increase, Current Increase; 但係transporting electricity果時Voltage increase, Current Decrease?

4. Circuit個Charge同Stactic個Charge係1樣定唔同? If唔同﹐有咩唔同?

5. Earth Wire 點解可以防shock? 唔比你掂中Earthwire同LiveWire之間ga?

1.樓上說了

2.電晶體又關電磁學甚麼事?=.="

3.V=E/Q 而 I=Q/t ,而當Q在transporting electricity果時減少,而V則增加.
不過有一疑問,Circuit不是閉合的嗎?不然那來Voltage,Current,即一開始便
transporting electricity了,怎麼還要分circuit和transporting electricity呢?
是不是漏了甚麼東西?

4.串錯字了嗎?是static嗎?

5.樓上說了,不過還不太詳盡.

作者: JOHNLAM17 時間: 19/6/2005 07:44 PM
第5條
應該係
earth wire is connected to the metal cover of the electrical appliances
sometimes live wire may touch the metal cover
then the cover contains electricity.
But earth wire conducts this electricity to the ground rather than the electricity going through our body.
唔比你掂中Earthwire同LiveWire之間ga<---唔明你問咩

仲有
我唔係好明earth wire 係用黎防electric shock ga 咩?
唔係用黎防止觸電咩?
防electric shock o既唔係fuse 咩?

[ Last edited by JOHNLAM17 on 2005-6-19 at 07:47 PM ]

作者: dolphin_ice 時間: 19/6/2005 08:21 PM
係喎...

但係fuse未容之前你會唔會被shock先?

作者: JOHNLAM17 時間: 19/6/2005 09:02 PM

Originally posted by 紅唇娃 at 2005-6-19 08:21 PM:
係喎...

但係fuse未容之前你會唔會被shock先?

應該唔會
因為有earth wire o係度

Electricity will go through the earth wire, but not the human body
It is because the resistance of earth wire is lower than that of human
So the free electrons will choose the earth wire.
Thus earth wire will conduct the electricity away, but not go through the body.
I think
XD

作者: jbano2 時間: 19/6/2005 09:08 PM

第5條
應該係
earth wire is connected to the metal cover of the electrical appliances
sometimes live wire may touch the metal cover
then the cover contains electricity.
But earth wire conducts this electricity to the ground rather than the electricity going through our body.

唔比你掂中Earthwire同LiveWire之間ga<---唔明你問咩

仲有
我唔係好明earth wire 係用黎防electric shock ga 咩?
唔係用黎防止觸電咩?
防electric shock o既唔係fuse 咩?

保險絲是防止過大電流流過啊!=.="
而地線才是防觸電啊!!
electric shock即是觸電啊!!=.="

作者: JOHNLAM17 時間: 19/6/2005 09:20 PM

Originally posted by jbano2 at 2005-6-19 09:08 PM:

保險絲是防止過大電流流過啊!=.="
而地線才是防觸電啊!!
electric shock即是觸電啊!!=.="

原來如此=.=
搞錯左d 中文名=.=
唔好意思

作者: dolphin_ice 時間: 20/6/2005 12:00 AM
我係想問﹐如果隻手放左0係Earth同Live之間﹐而fuse未容
咁會唔會shock?

作者: 鬼鬼 時間: 20/6/2005 03:48 AM
2.Transistor係做咩ga? base 同common又有咩用?
<<<<
Transistor can be used in making IC.
Base and Common are the ports of the Transistor.

3. 點解circuit入面Voltage increase, Current Increase; 但係transporting electricity果時Voltage increase, Current Decrease?
<<<<<<
By V=IR,
if the circuit component doesnt change i.e. R is constant,
than V increase, I increase,
eg. when R = 100ohm
100V = 1A x 100Ohm
1000V = 10A x 100Ohm

When Transporting electricity,
the power(energy carried) of the electricity is the same,
P=IV
100 = 100 x 1
100 = 10 x 10 etc

4. Circuit個Charge同Stactic個Charge係1樣定唔同? If唔同﹐有咩唔同?
<<<<<<
More or less the same.
The main difference is that,
electrons in electrostatic is static,
but in complete circuit, they flow around the circuit.

[ Last edited by 鬼鬼 on 2005-6-20 at 03:51 AM ]

作者: dolphin_ice 時間: 21/6/2005 04:02 PM
Oh I see~

thanks :D

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