Kirchhoff\'s law

Kirchhoff's law

noun Physics, Electricity.
1.
the law that the algebraic sum of the currents flowing toward any point in an electric network is zero.
2.
the law that the algebraic sum of the products of the current and resistance in the conductors forming a closed loop in a network is equal to the algebraic sum of the electromotive forces in the loop.

Origin:
1865–70; named after G. R. Kirchhoff
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Kirchhoff's law is always a great word to know.
So is critical mass. Does it mean:
any of the energy levels of a physical system, such as an atom or molecule, that has higher energy than the lowest energy level
the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate
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