Engineering Board Exam Reviewer · Series-Parallel Circuits · medium

In the ladder network shown, V=18 V, R1=12, , R2=40, , R3=55, , and R4=5, . Find the total resistance seen by the source.

  1. 112,
  2. 56.58,
  3. 27.86,
  4. 36,

Answer

D. 36,

Solution

Start at the far end: R3+R4=60, . In parallel with R2: (40, )(60, )/40, +60, =24, . Add R1: RT=12, +24, =36, .

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