current 問題

如果用現實形象來理解，一條主要道路（沒有其他路線）以前收費１０元，現在收費２０元，當然流量少了。

V = I * R
I = V / R
Ia = V / (R + R)
Ia = V / 2R
Ia = 1/2 * V / R
Ia = 1/2 * I
所以一個in series 既curcut本身有一個light bulb係到之後加多個light bulb，個current會變細左

希望解答到你 ^^

因爲串聯電路計算如下

The total resistance of the circuit (also called effective resistance) is equal to the sum of the individual resistances.


圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/rtser.gif

I = V/Rt

一个串联电路有一个以上的电阻（凡是使用电力做工作） ，并得到它的名字， 只拥有一条道路为收费沿着。 Charges must move in "series" first going to one resistor then the next. 收费必须在"系列"的第一要一个电阻，然后下一步。 If one of the items in the circuit is broken then no charge will move through the circuit because there is only one path. 如果项目之一，在电路坏，然后不收费会动议通过电路因为只有一条路可走。 There is no alternative route. 别无他路。 Old style electric holiday lights were often wired in series. 旧式电动节日灯往往在有线系列。 If one bulb burned out, the whole string of lights went off. 如果一个灯泡烧毁，整串灯爆炸。
Below is an animation of a series circuit where electrical energy is shown as gravitational potential energy (GPE). 下面是一个动画的一个串联电路如电能表现为引力势能（ gpe ） 。 The greater the change in height, the more energy is used or the more work is done. 更大的变化高度，更多的精力是用或更多的工作做。

圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/series.gif

在这个动画，你应该注意以下几点：


The battery or source is represented by an escalator which raises charges to a higher level of energy. 电池或来源是代表一个电梯引起收费较高水平的能量。
As the charges move through the resistors (represented by the paddle wheels) they do work on the resistor and as a result, they lose electrical energy. 至于收费动议通过电阻 （代表桨轮子） ，他们做工作，对电阻，并作为结果，他们失去电能。
The charges do more work (give up more electrical energy) as they pass through the larger resistor. 收费多做工作（放弃更多电能） ，因为他们通过电阻较大。
By the time each charge makes it back to the battery, it has lost all the energy given to it by the battery. 由时间，每项控罪使它回到电池，它已失去了所有的能量给它的电池。
The total of the potential drops ( - potential difference ) across the resistors is the same as the potential rise ( + potential difference ) across the battery. 总的潜在滴（ -电位差）海峡电阻是相同的电位升高（ +位差）整个电池。 This demonstrates that a charge can only do as much work as was done on it by the battery. 这表明收费只能做大量工作，就象它的电池。
The charges are positive so this is a representation of Conventional Current (the apparent flow of positive charges) 收费阳性，因此这是一个代表性的常规电流 （表观流正电荷）
The charges are only flowing in one direction so this would be considered direct current ( D.C. ). 收费只流向一个方向，所以这将被视为直接电流 （ 直流 ） 。


The following rules apply to a series circuit : 以下规则适用于串联电路 ：


The sum of the potential drops equals the potential rise of the source. 这笔潜在滴等于潜在增长源。

圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/vtser.gif


The current is the same everywhere in the series circuit. 目前是一样的，在串联电路。

圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/curser.gif


The total resistance of the circuit (also called effective resistance ) is equal to the sum of the individual resistances. 总电阻电路（又称有效抵抗 ）是相等的一笔个人阻力。

圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/rtser.gif





Ohm's Law may be used in a series circuit as long as you remember that you can use the formula with either partial values or with total values but you can not mix parts and totals. 欧姆定律 ，可用于在一个串联电路，只要你记得，你可以用公式或局部的价值观或总价值，但你不能组合零件总数。

圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/ohmstot.gif



圖片參考：http://regentsprep.org/Regents/physics/phys03/bsercir/ohmspart.gif