High School

Based on Kirchhoff's Law and the law of conservation of energy, if there is a junction with 4 wires and two of the wires are bringing in a current of 10 A and 7 A, what would the combined amount of current coming out of the other two wires be?

A) 3 A
B) 5 A
C) 17 A
D) 20 A

Answer :

Final answer:

In-line with Kirchhoff's law and conservation of energy, the combined current exiting the junction via the other two wires will also be 17 A, equivalent to the combined total current entering the junction.

Explanation:

Based on Kirchhoff's Law and the law of conservation of energy, which states that the total current or charge entering a junction must be equal to the total current or charge leaving the junction, the combined amount of current coming out of the other two wires must equal the total current entering the junction. In this case, the two wires are bringing in a current of 10 A and 7 A, respectively, therefore, the combined total current entering the junction is 17 A (10 A + 7 A). Thus, the combined amount of current that will be exiting the junction through the other two wires, according to Kirchhoff's first rule, is also 17 A.

Learn more about Kirchhoff's Law here:

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