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Rinoa92 Rinoa92
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11 years ago
Using Kirchhoff's rules with R3 = 8.00 k? for the circuit below, find the following:

http://i47.tinypic.com/aku9o9.png

A) The current in R1, please give answers in mA.
B) The current in R2
C) The current in R3
D) The potential difference between points c and f

Thank you!
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wrote...
#1
11 years ago
I1 be a
I2 be b
I3 be c
and b = a + c
Left loop:

2 a+ 3 b= 10.  currents are in mA.

a+ 3 ( a + c)= 10.  

Right loop:

8 c + 3 ( a + c) = 20

Solving

 I1 = a = 1.4286 mA
 I3= c = 1.4286  mA and

I2 = 2.8572 mA

P.D across  c and f in the figure
 
 60 - 2.8572*3 = 51.4284 V

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