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In this class, one of the important goals is understanding mechanism. Pick one of kirchoff's rules...

In this class, one of the important goals is understanding mechanism. Pick one of kirchoff's rules for direct current circuits, state the rule clearly and completely. Then discuss the mechanism behind the rule and describe whether an understanding has been relevant to your use of the rule

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Answer #1

Kirchhoff's junction rule states that the algebraic sum of the currents at any branch point or junction in a circuit is zero

Kirchhoff's junction rule is an application of the principle of conservation of electric charge: current is flow of charge per time, and if current is constant, that which flows into a point in a circuit must equal that which flows out of it.

Kirchhoff's junction law is limited in its applicability over regions, in which charge density may not be constant. Because charge is conserved, the only way this is possible is if there is a flow of charge across the boundary of the region. This flow would be a current, thus violating the law.

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