Practice Problem

R₂ and R₅ are series (add)

R₂₅ and R₃ are parallel:

1/R₂₅₃ = 1/10 + 1/40 = 4/40 + 1/40 = 5/40 = 1/8

Now it is a series circuit:

R_T = 8 + 8 + 4 = 20Ω

I_T = V_T/R_T = 120/20 = 6 A