Engineering Board Exam Reviewer · Series-Parallel Circuits · medium

In the circuit shown, V=30 V, R1=10, , R2=6, , R3=9, , and R4=30, . Find the current through R4.

  1. 750 mA
  2. 500 mA
  3. 250 mA
  4. 375 mA

Answer

B. 500 mA

Solution

IT=1.5 A and Rp=10, , so the voltage across the parallel part is Vp=ITRp=(1.5 A)(10, )=15 V. Then I4=Vp/R4= 15 V30, =500 mA.

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