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標題: 後波燈問題? [打印本頁]

作者: fung198586 時間: 2008-7-24 22:43
標題: 後波燈問題?
新燈跟一粒後波燈，點整多一粒??

作者: 阿De 時間: 2008-7-24 22:53
可以直接並聯

[ 本帖最後由阿De 於 2008-7-25 00:23 編輯 ]

作者: fung198586 時間: 2008-7-24 23:35
明
但買1.5v定係3v??

作者: 碟碟 時間: 2008-7-24 23:36

原帖由 阿De 於 2008-7-24 22:53 發表

 登錄/註冊後可看大圖

可以直接串聯

姐係新燈正------- 正(第1粒燈)負 ------　正(第2粒燈)負 ------ 負新燈

唔知你明唔明

咁樣好似唔通喎
應該並聯出來一粒咪得囉

姐係張原本果粒or自己買同埋另加一粒白色既正負痴埋,再張正負分開落新燈

[ 本帖最後由碟碟於 2008-7-24 23:39 編輯 ]

作者: 阿De 時間: 2008-7-25 00:22

好對唔住.. c兄

我心急答錯野

sorry

作者: fung198586 時間: 2008-7-25 00:33
但買1.5v定係3v?????

作者: faifaifai1437 時間: 2008-7-25 00:43

原帖由碟碟於 2008-7-24 11:36 PM 發表

 登錄/註冊後可看大圖

咁樣好似唔通喎
應該並聯出來一粒咪得囉

姐係張原本果粒or自己買同埋另加一粒白色既正負痴埋,再張正負分開落新燈

師兄,今小弟想問如果串聯司以嗎???
因為小弟正左串聯,好在架車味正好姐

作者: 阿De 時間: 2008-7-25 00:44

原帖由 faifaifai1437 於 2008-7-25 00:43 發表

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師兄,今小弟想問如果串聯司以嗎???
因為小弟正左串聯,好在架車味正好姐

對唔住.. 係咪因為見到我咁教所以你整左..sorry..

作者: faifaifai1437 時間: 2008-7-25 00:51

原帖由 阿De 於 2008-7-25 12:44 AM 發表

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對唔住.. 係咪因為見到我咁教所以你整左..sorry..

唔係,係我自己自作聰明睇到新燈個頭燈今正我又走去今正姐
好在有人問呢個問題炸

作者: faifaifai1437 時間: 2008-7-25 00:51
今姐係得唔得嫁

thx

作者: 阿De 時間: 2008-7-25 00:55

原帖由 faifaifai1437 於 2008-7-25 00:51 發表

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唔係,係我自己自作聰明睇到新燈個頭燈今正我又走去今正姐
好在有人問呢個問題炸

我頭先睇post 都係第1時間咁諗

之後再番轉頭睇下部車先知原來我自己都係整左並聯

作者: faifaifai1437 時間: 2008-7-25 01:03

原帖由 阿De 於 2008-7-25 12:55 AM 發表

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我頭先睇post 都係第1時間咁諗

之後再番轉頭睇下部車先知原來我自己都係整左並聯

今係咪姐係唔得啊

作者: fung198586 時間: 2008-7-25 01:17

仲未有人答我問題

作者: ford 時間: 2008-7-25 02:13

原帖由 fung198586 於 2008-7-25 01:17 發表

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仲未有人答我問題

用電錶試試原臧輸出再買,好多人斷估,拖死組燈就麻煩

作者: eleung838 時間: 2008-7-25 04:22
買多一粒tamiya 原裝後燈
用 series circuits 方法接連一起
插回mfc後燈位置
看圖
The Link is http://physics.bu.edu/py106/notes/Circuits.html
我全部RC貨櫃車都有後燈

Series and Parallel Circuits
7-10-00

Section 19.1

Series circuits
A series circuit is a circuit in which resistors are arranged in a chain, so the current has only one path to take. The current is the same through each resistor. The total resistance of the circuit is found by simply adding up the resistance values of the individual resistors:

equivalent resistance of resistors in series : R = R1 + R2 + R3 + ...

看圖4

A series circuit is shown in the diagram above. The current flows through each resistor in turn. If the values of the three resistors are:

With a 10 V battery, by V = I R the total current in the circuit is:

I = V / R = 10 / 20 = 0.5 A. The current through each resistor would be 0.5 A.

Parallel circuits
A parallel circuit is a circuit in which the resistors are arranged with their heads connected together, and their tails connected together. The current in a parallel circuit breaks up, with some flowing along each parallel branch and re-combining when the branches meet again. The voltage across each resistor in parallel is the same.

The total resistance of a set of resistors in parallel is found by adding up the reciprocals of the resistance values, and then taking the reciprocal of the total:

equivalent resistance of resistors in parallel: 1 / R = 1 / R1 + 1 / R2 + 1 / R3 +...

看圖5

A parallel circuit is shown in the diagram above. In this case the current supplied by the battery splits up, and the amount going through each resistor depends on the resistance. If the values of the three resistors are:

With a 10 V battery, by V = I R the total current in the circuit is: I = V / R = 10 / 2 = 5 A.

The individual currents can also be found using I = V / R. The voltage across each resistor is 10 V, so:

I1 = 10 / 8 = 1.25 A
I2 = 10 / 8 = 1.25 A
I3=10 / 4 = 2.5 A

Note that the currents add together to 5A, the total current.

A parallel resistor short-cut
If the resistors in parallel are identical, it can be very easy to work out the equivalent resistance. In this case the equivalent resistance of N identical resistors is the resistance of one resistor divided by N, the number of resistors. So, two 40-ohm resistors in parallel are equivalent to one 20-ohm resistor; five 50-ohm resistors in parallel are equivalent to one 10-ohm resistor, etc.

When calculating the equivalent resistance of a set of parallel resistors, people often forget to flip the 1/R upside down, putting 1/5 of an ohm instead of 5 ohms, for instance. Here's a way to check your answer. If you have two or more resistors in parallel, look for the one with the smallest resistance. The equivalent resistance will always be between the smallest resistance divided by the number of resistors, and the smallest resistance. Here's an example.

You have three resistors in parallel, with values 6 ohms, 9 ohms, and 18 ohms. The smallest resistance is 6 ohms, so the equivalent resistance must be between 2 ohms and 6 ohms (2 = 6 /3, where 3 is the number of resistors).

Doing the calculation gives 1/6 + 1/12 + 1/18 = 6/18. Flipping this upside down gives 18/6 = 3 ohms, which is certainly between 2 and 6.

Circuits with series and parallel components
Many circuits have a combination of series and parallel resistors. Generally, the total resistance in a circuit like this is found by reducing the different series and parallel combinations step-by-step to end up with a single equivalent resistance for the circuit. This allows the current to be determined easily. The current flowing through each resistor can then be found by undoing the reduction process.

General rules for doing the reduction process include:

Two (or more) resistors with their heads directly connected together and their tails directly connected together are in parallel, and they can be reduced to one resistor using the equivalent resistance equation for resistors in parallel.

Two resistors connected together so that the tail of one is connected to the head of the next, with no other path for the current to take along the line connecting them, are in series and can be reduced to one equivalent resistor.
Finally, remember that for resistors in series, the current is the same for each resistor, and for resistors in parallel, the voltage is the same for each one.

[ 本帖最後由 eleung838 於 2008-7-25 04:29 編輯 ]

作者: z1118 時間: 2008-7-25 06:15

原帖由 eleung838 於 2008-7-25 04:22 發表

 登錄/註冊後可看大圖

買多一粒tamiya 原裝後燈
用 series circuits 方法接連一起
插回mfc後燈位置
看圖
The Link is http://physics.bu.edu/py106/notes/Circuits.html
我全部RC貨櫃車都有後燈

Series and Parallel Circuits
7- ...

7.2v 輸入用幾大電阻???接普通 led

作者: eleung838 時間: 2008-7-25 13:12
標題: 回復 16# 的帖子
看圖 2
The Link is http://en.wikipedia.org/wiki/Electrical_resistance

Electrical resistance
From Wikipedia, the free encyclopedia
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A 750-kΩ resistor, as identified by its electronic color code. An ohmmeter could be used to verify this value.Electrical resistance is a ratio of the degree to which an object opposes an electric current through it, measured in ohms. Its reciprocal quantity is electrical conductance measured in siemens. Assuming a uniform current density, an object's electrical resistance is a function of both its physical geometry and the resistivity of the material it is made from:

看圖 1

where

"l" is the length
"A" is the cross sectional area, and
"ρ" is the resistivity of the material
Discovered by Georg Ohm in the late 1820s[1], electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm, symbol Ω. The resistance of an object determines the amount of current through the object for a given potential difference across the object.

看圖 2

where

R is the resistance of the object, measured in ohms, equivalent to J·s/C2
V is the potential difference across the object, measured in volts
I is the current through the object, measured in amperes
This ratio of Voltage divided by Electric current is also called the Chordal Resistance.

For a wide variety of materials and conditions, the electrical resistance does not depend on the amount of current through or the amount of voltage across the object, meaning that the resistance R is constant.

[ 本帖最後由 eleung838 於 2008-7-25 13:16 編輯 ]

作者: faifaifai1437 時間: 2008-7-26 00:32
都係唔明

唔識英文,姐係1.5v定3v???係咪要並聯???
家裹無電錶,試唔到
唔該晒今多位師兄

作者: eleung838 時間: 2008-7-26 01:55

原帖由 faifaifai1437 於 2008-7-26 00:32 發表

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都係唔明
唔識英文,姐係1.5v定3v???係咪要並聯???
家裹無電錶,試唔到
唔該晒今多位師兄

買多一粒tamiya 原裝後燈
用 series circuits 方法接連一起
插回mfc後燈位置

作者: ford 時間: 2008-7-26 03:07

原帖由 eleung838 於 2008-7-26 01:55 發表

 登錄/註冊後可看大圖

買多一粒tamiya 原裝後燈
用 series circuits 方法接連一起
插回mfc後燈位置

英文內容詳細但都喺買番啦原裝後燈方便

作者: fung198586 時間: 2008-7-26 20:01
買原裝後燈一粒要幾錢?同埋係邊度有得買?

作者: ford 時間: 2008-7-27 01:33

原帖由 fung198586 於 2008-7-26 20:01 發表

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買原裝後燈一粒要幾錢?同埋係邊度有得買?

kws唔會無

作者: eleung838 時間: 2008-7-27 02:43

原帖由 ford 於 2008-7-27 01:33 發表

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kws唔會無

彧去佐敦白加士街興k 訂購和查詢

作者: fung198586 時間: 2008-8-10 04:17
原裝後燈係吾係買TLU-01用個d白色5mm??
同新櫃點裝多一對紅燈??
定係去鴨記買3V個d led??
吾該位c兄解答我~~~~~~~thx

作者: sunnykwok 時間: 2008-8-10 08:32
標題: 回復 24# 的帖子
you can call me , can i help you?

作者: dm9261 時間: 2008-8-10 09:40
並聯/串聯都冇問題

不過串聯會愈裝愈暗

而並聯會用多d電

如果串聯最好唔多過兩粒

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