Kirchhoff's Law

[TJ]

Kirchhoff's Law problem. I have figured most of the problems but these two has me stumped. Please help.


Please see the figures and my questions at http://quasarsvc.bizland.com/DC_Circuit.doc

http://quasarsvc.bizland.com/DC_Circuit.doc

[Chen]

Can you show the steps and figures, to find resistor sequence(s) to find Rt so I may work the other values
Find the equivalent resistance of R_5, R_6 and R_7, which are connected in parallel, and call it R_{5,6,7}. Find the equivalent resistance of R_4 and R_{5,6,7}, which are connected in series, and call it R_{4,5,6,7}. Find the equivalent resistance of R_3 and R_{4,5,6,7}, which are connected in parallel, and call it R_{3,4,5,6,7}. Find the equivalent resistance of R_1 and R_2, which are connected in parallel, and call it R_{1,2}. Finally find the equivalent resistance of R_{1,2}, R_{3,4,5,6,7} and R_8, which are connected in series, and that is the equivalent resistance of the whole circuit.

[Chen]

The numbers in the loop problem represent the potential drop on each of the resistors. To find the value of the potential drops you have to find the current through each of the resistors, and to find that you first need to find the equvilanet reisstance of the whole circuit.

[TJ]

1) R567 = 10
2) R567+R4 = 20
3) R4567+R3 = 12
4) R1&R2 = 12
5) R12(12)+R34567(12)+R8(6) = 30 = Rt ?
Appreciate your efforts.
TJ

[Chen]

Yes it's 30\Omega in the first question.

[TJ]

Thank you for acknowledging the Rt so I can work the rest of them

[TJ]

Have E1,E2,E3 = 12v
Have I1=0.6, I2=0.4, I3=0.4
Have P1=7.2, P2=4.8,P3=4.8
need understanding of "how to" relating to R4=10, Et=30, Rt=30 It=1.0 to complete E4 or I, and would not that E value be the same for E5, E6, E7, E8?
Thanks
TJ