What is Kirchhoff: Definition and 64 Discussions

Kirchhoff, Kirchoff or Kirchhoffer is a German surname. Notable people with the surname include:

Adolf Kirchhoff (1826–1908), German classical scholar and epigrapher
Alfred Kirchhoff (1838–1907), German geographer and naturalist
Alphonse Kirchhoffer (1873–1913), French Olympic fencer
Charles William Henry Kirchhoff (1853-1916), American editor and metals expert
Detlef Kirchhoff (1967–), German rower
Fritz Kirchhoff (1901–1953), German screenwriter, film producer and director
Gustav Kirchhoff (1824–1887), German physicist — Kirchhoff's laws in electricity, spectroscopy, thermochemistry.
Gottlieb Kirchhoff (1764–1833), German chemist (died in Saint Petersburg)
Jan Kirchhoff (1990–), German footballer, currently playing for KFC Uerdingen 05
Mary Kirchoff (born 1959), American fantasy novelist
Paul Kirchhoff (1900–1972), German anthropologist and ethnologist of pre-Columbian Mesoamerican cultures
Robert Kirchhoff (born 1962), Slovak film director
Ulrich Kirchhoff (1967–), German show jumping champion

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  1. A

    The Physical Significance of the Second Term in Kirchhoff's Current Law

    Hi Everyone, I'm told that the following formula represents Kirchhoff's current law g_1 E_{1 n}+\varepsilon_1 \frac{\partial E_{1 n}}{\partial t}=g_2 E_{2 n}+\varepsilon_2 \frac{\partial E_{2 n}}{\partial t} where the first term on each side is Ohm's law and the conductive current and...
  2. S

    Accuracy of Kirchhoff diffraction theory

    Hi guys, My research project involves a paraboloidal telescope with a primary diameter of 25 meters, and a focal length of 10 meters. My goal is to come up with the mathematics and numerics to determine the surface profile error of the primary mirror. We will take a point source of 2mm...
  3. K

    What is the correct way to apply Kirchhoff's rules to this circuit?

    http://img17.imageshack.us/img17/201/73448266.jpg let's suppose that we know all resistors and voltages by applying kirchhof rules we have V1 - i*R1 - i*R2 -i2*R3 = 0 V1 - i*R1 - i*R2 - i1*R4 - V2 = 0 -V2 + i2*R3 - i1*R4 = 0 we know V1,V2,V3 R1,R2,R3 and we can find the currents...
  4. fluidistic

    Understanding Kirchhoff's Laws: Solving Circuits with Multiple Voltage Sources

    Homework Statement See picture for the problem. 1)Calculate the work done to move a charge a= 0.7 x 10 ^(-3)C from A to B, passing by R2. 2)The power dissipated in R3. 3)The current passing by R1. 2. Given equations R1=R3=100 omhs, R2=200 ohms, R4=300 omhs. e1=e3= 5 V, e2=10 V and...
  5. E

    Kirchhoff's Law Derived from Faraday's Induction - EMROZ

    Please see the attachment. There I have derived Kirchhoff's Voltage law from Faraday's Induction law. Reply me if I have done something wrong and also notify me if this proof has been made somewhere else. Thanking you, EMROZ
  6. D

    Solving Kirchhoff's Problem: Finding Current in a Directed Graph

    Homework Statement I have been given the above information and asked to find the current in the edge ac. s is the sink, t is the source. Homework Equations Kirchoff's First Law, current in = current out. Kirchoff's Second Law, the sum of resistance.current for all vertices in a cycle = 0. The...
  7. S

    Is This the Correct Solution for Kirchhoff's Loop Problem?

    Homework Statement We are to find I1, I2 and I3 in the diagram. Homework Equations These are the three equations I got. I need to know if they're correct. x=I1 y=I2 z=I3 12y-24+35x=0 35x+34z-18=0 x=y+z The Attempt at a Solution Values I got on solving: I1=0.508 I2=0.511...
  8. N

    Electrodynamics: AC-circuits and Kirchhoff

    Homework Statement Hi all. Please take a look at the attached circuit. I want to find the current through the capacitor, and of course I will use Kirchhoffs laws for AC-current. In this case, ε(t) = ε_0*cos(ωt). My question is: If this was an DC-circuit, I would define e.g...
  9. G

    Simple Kirchhoff Loop problem with inductor

    Homework Statement Just refer to the figure. The part shown is a part of a big circuit which you and anybody else shouldn't worry about.Homework Equations The Attempt at a Solution I considered the battery terminals to be at 10 and 0V respectively. So the farther end of the resistor should be...
  10. S

    Kirchhoff and Potentials question.

    Excuse me but, this is a rough translaton from a Portuguese homework. Also, excuse me for my lack of knowledge in some physics, I do a programming course and one of the teachers said we had to know about this. Homework Statement http://img181.imageshack.us/img181/7084/87202322av0.jpg...
  11. G

    How can I solve a multiloop circuit using Kirchhoff's laws?

    Homework Statement What is the current in I(1), I(2), and I(3)? Homework Equations At nodes \sumI = 0 Loops \sumV = 0 The Attempt at a Solution Ok, I'm definitely new to this multiloop stuff so I'm not quite sure what the best way to work these problems is. Here's what i have for...
  12. C

    Kirchhoff loop rule and Ohm's Law

    Homework Statement To understand the behavior of the current and voltage in a simple R-C circuit A capacitor with capacitance C is initially charged with charge q0. At time t=0 a resistor with resistance R is connected across the capacitor PART A Use the Kirchhoff loop rule and Ohm's...
  13. A

    Determining Current Through 6 & 9 with Maxwell & Kirchhoff

    (1) USE MAXWELL CURRRNT CIRCULATION METHOD TO DETERMINE THE CURRENT THROUGH 6 AND 9. (2) USE KIRCHHOFFS LAW ALSO TO DETERMINE THE CURRENT THROUGH 6 AND 9. Thanks.
  14. K

    Kirchhoff Circuit: Current, Resistors, Voltage

    Circuit Current I have the circuit below (also attached as an image): Note: ^^^^ & <<<< = resistors [-]=power supply ...=just space (-) & (+) indicates + & - side of battery A,B represent the junctions |-----^^^^------A-----^^^^------| |......|......| <......<......(-)...
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