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و شكرا لكم

تفضل من هنا
http://www.physics.uoguelph.ca/tutorials/ohm/Q.ohm.intro.parallel.html

Resistors can be connected such that they branch out from a single point (known as a node), and join up again somewhere else in the ciruit. This is known as a parallel connection. Each of the three resistors in Figure 1 is another path for current to travel between points A and B.
Figure 1 Example of a circuit containing three resistors connected in parallel
Figure2 Circuit containing resistors in parallel, equivalent to Figure 1

Note that the node does not have to physically be a single point; as long as the current has several alternate paths to follow, then that part of the circuit is considered to be parallel. Figures 1 and 2 are identical circuits, but with different appearances.

At A the potential must be the same for each resistor. Similarly, at B the potential must also be the same for each resistor. So, between points A and B, the potential difference is the same. That is, each of the three resistors in the parallel circuit must have the same voltage.

[1]

Also, the current splits as it travels from A to B. So, the sum of the currents through the three branches is the same as the current at A and at B (where the currents from the branch reunite).

[2]

By Ohm's Law, equation [2] is equivalent to:

[3]

By equation [1], we see that all the voltages are equal. So the V's cancel out, and we are left with

[4]

This result can be generalized to any number of resistors connected in parallel.

[5]

Since resistance is the reciprocal of conductance, equation [5] can be expressed in terms of conductances.

اخي بصيطة
rx=r1*r2\r1+r2

سلام
قال السيد اوم

R = V/i
R1 = V1/i1
R2 = V2/i2
.
.
بما أن الربط متوازي اذن حسب السيد كرشوق

V = V1 = V2 = …..
I = I1 + I2 + …..
1/r = (i1 +i2 + …. )/ V = I1 /v +i2 /v + ….. = I1/v1 + I2 /v2 +…..
1/r = 1/r1 +1/r2

على حسب قانون اوم
فرق الجهد=التيار* المقاومة
اذا
المقاومة=فرق الجهد/التيار

اذا كان عندك اكثر من مقاومة متوازيات يعني ان الفولتية متساوية بين طرفي كل المقاومات
و التيار اللي داخل في المقاومات نفس التيار اللي خارج

مجموع المقاومات على التوازي=فرق الجهد /التيار ... صح

التيار الكلي = مجموع التيارات الخارجة من المقاومات
الفولتية متساوية

فرق الجهد/ المقاومة=التيار =تيار1+تيار2+تيار3+...

فرق الجهد /المقاومة=فرق الجهد1/المقاومة1+فرق الجهد2/المقاومة2+فرق الجهد3/المقاومة3+...
بما ان
فرق الحهد=فرق الجهد1=فرق الجهد2=فرق الجهد3=...


يتبقى
1/المقاومة=1/المقاومة1+1/المقاومة2+1/المقاومة3+...

المقاومة = مقلوب (مجموع مقلوب المقاومات)

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