chem同phy有d 野想搵人講解下

[H]bunbunbunbun

因為anode同cathode 0既接觸面細, 個反應慢
而external circuit比d電子transfer得快好多
你就咁放舊電係櫃唔理佢兩三年都會無左唔少電, 視乎個cell 0既 shelf life (個字已經唔記得, 錯左請提我)

[ 本帖最後由 [H]bunbunbunbun 於 29-8-2008 02:46 編輯 ]

piyopiyo

原帖由 samsony 於 29-8-2008 02:16 發表
但係你個種more reactive 而lose electrons......不是應該lose electrons去form salt咩.....但now  cell 呢種係lose左係個external circuit 到......點解???@@

你不如由一開頭ionic bond果課睇起...理解左咩叫ion,點解要lose e-果d野先好睇呢課[[tk_30]]

samsony

如果係你呢個說法咁我應該係明了....thx~

回復 12# 的帖子
多謝提點......但我其實明既可能言詞中唔係咁顯示到比你睇....sorry.....thx~

[S]【YU】

Anode Cathode 痴埋一齊的話,咁同將樽OA倒落樽RA度有乜分別?

你整個cell用黎發電,但係d電係邊度黎?

basic defnintion of chemical cell係乜?

electrolyte 點通電?

electron唔走external circuit唔通曉得瞬間轉移?

知唔知 metal lose 左 electron 去左邊? 點成complete circuit? 明晒先好話明.

piyopiyo

[YU]爺又一次直斥其非[[tk_30]]

無．話可說

我對phy既問題有少少補充
簡單來說 An electric field is a region where a force acts on a charged body placed in the region.
而the direction of electric field唔一定由+ve charged去-ve charged
正確來說是由高既electric potential去低既electric potential

而The direction of magnetic field at a point is taken as the direction of the force that acts on a north magnetic pole there.

如果有錯請指證 (逃

[S]【YU】

An electric field is a region where a force acts on a charged body placed in the region.

E-field gives the direction of force acting on a +ve charge.

The direction of magnetic field at a point is taken as the direction of the force that acts on a north magnetic pole there.

Nobody uses force acting on north magnetic pole as definition of magnetic field.

adamsteve

原帖由 [S]【YU】 於 29-8-2008 19:20 發表

E-field gives the direction of force acting on a +ve charge.


Nobody uses force acting on north magnetic pole as definition of magnetic field.

我諗起kennth wong 1201 佢成日講 "positive charge and negative charge" 佢個音調好正架@@

我覺得e field b field都係一種自己作出黎ge野 叫做 "會影響charge 或者 magnet 的力牆 "會唔會易明d