Calculation Procedure

1 . Label the Circuit

Label all the sections. Mark the direction of current through each resistor (Fig. 1.2). The equivalent resistance of the series-parallel combination of resistors can be found by successive applications of the rules for combining series resistors and parallel resistors.

Figure 1.2: Labeling the circuit of Fig. 1.1.

2. Combine All Series Resistors

In a series circuit, the total or equivalent resistance R _EQS seen by the source is equal to the sum of the values of the individual resistors: R _EQS= R ₁+ R ₂+ R ₃+ + R _N .

Calculate the series equivalent of the elements connected in series in sections DE, CG, and GF: R _EQS (section DE)= R ₁₃+ R ₁₄=200+40=240 ?, R _EQS (section CG)= R ₇+ R ₈=200+400=600 ?, and R _EQS (section GF)= R ₁₀+ R ₁₁=400+200= 600 ?. Replace the series elements included in sections DE, CG, and GF by their equivalent values (Fig. 1.3).

Figure 1.3: Series elements replaced by their equivalent values.

3. Combine All Parallel Resistors

In...