Engineering Board Exam Reviewer · Parallel Circuits · hard

In the parallel circuit shown, V=48 V, R1=24, , R2=48, , and R3=16, . If R2 burns out (opens), what is the new total current from the source?

  1. 6 A
  2. 1 A
  3. 5 A
  4. 7 A

Answer

C. 5 A

Solution

The other branches are unaffected because each still has the full source voltage. Originally IT=6 A and the failed branch carried V/R2=1 A. The new total is 6 A-1 A=5 A.

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