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MCAT Question A Day - 1/8/14 - Answer!

What must be the reading in the ammeter A for the circuit section shown?

A.  0 A
B.  6.0 A
C.  8.0 A
D.  12 A

The correct answer is (D). Kirchhoff’s law says the current entering a junction must equal the current leaving the junction. The current entering junction 1 is 6.0 A, so the current entering junction 2 is 12 A, and the current leaving 2 and going through the ammeter is 12 A.

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