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单词 Kirchhoff’s laws
释义
Kirchhoff’s laws

Physics
  • Two laws relating to electric circuits, first formulated by Gustav Kirchhoff. (a) The current law states that the algebraic sum of the currents flowing through all the wires in a network that meet at a point is zero. (b) The voltage law states that the algebraic sum of the e.m.f.s within any closed circuit is equal to the sum of the products of the currents and the resistances in the various portions of the circuit.


Astronomy
  • Three laws concerning spectra, stated in 1859 by the German physicist G. R. Kirchhoff:

    1. 1. A solid, liquid, or gas under high pressure, when heated to incandescence, produces a continuous spectrum.

    2. 2. A gas under low pressure, but at a sufficiently high temperature, produces a spectrum of bright emission lines.

    3. 3. A gas at low pressure (and low temperature), lying between a hot continuum source and the observer, produces an absorption line spectrum, i.e. a number of dark lines superimposed on a continuous spectrum.


Electronics and Electrical Engineering
  • (i) At any point in an electric circuit the algebraic sum of the currents meeting at that point is zero.

    (ii) In any closed electric circuit the algebraic sum of the products of current and resistance in each part of the network is equal to the algebraic sum of the electromotive forces in the circuit.

    http://www.ibiblio.org/kuphaldt/electricCircuits/DC/DC_6.html How Kirchhoff’s laws apply to divider circuits


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