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Equivalent Resistance Seen by a Given Source

For the circuit shown in Figure 2.42 (attached file), find:
a) The equivalent resistance seen by the source.
b) The current through and the power absorbed by the 90-Ω resistance. Given Vs= 110 V, R1= 90 Ω, R2= 50 Ω, R3= 40 Ω, R4= 20 Ω, R5= 30 Ω, R6= 10 Ω, R7= 60 Ω, R8= 80 Ω.


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The solution attaches a .doc file that shows how to calculate the equivalent resistance seen by the source of the given circuit diagram. PDF alternative included.