TP 21.37

Given: R₁ = 1.50 W

R₂ = 2.50 W

R₃ = 4.80 W

R₄ = 3.30 W

R₅ = 8.10 W

R₆ = 6.30 W

1/R₃₄₅ = 1/R₃ + 1/R₄ + 1/R₅ = 1/(4.80 W) + 1/(3.30 W) + 1/(8.10 W) = 0.634 W^-1 R₃₄₅ = 1.58 W

R₃₄₅₆ = R₃₄₅ + R₆ = 1.58 W + 6.30 W = 7.88 W

1/R₁₂₄₅₆ = 1/R₁ + 1/R₂ + 1/R₃₄₅₆ = 1/(1.50 W) + 1/(2.50 W) + 1/(7.88 W) = 1.19 W^-1 R₁₂₃₄₅₆ = 0.838 W