Engineering Board Exam Reviewer · Series-Parallel Circuits · medium

In the circuit shown, V=18 V, R1=8, , R2=3, , R3=3, , and R4=12, . Find the total resistance seen by the source.

  1. 26,
  2. 9.33,
  3. 21.5,
  4. 12,

Answer

D. 12,

Solution

R2 and R3 are in series: R23=6, . This branch is in parallel with R4: Rp=(6, )(12, )/6, +12, =4, . Then RT=R1+Rp=8, +4, =12, .

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