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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