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
Hello everybody
I am currently looking at diffraction through a rectangular aperture. I am looking at an aperture which is large compared to wavelength, and am looking at diffraction at all angles behind the aperture in a distance which is approx equal to the size of the aperture. I am...
I tried doing three loops. For the bottom I did 9-I1(1) + I2(1) - I3(10) -12 = 0, for the upper left corner I did 12 - I2(1)- I2(5) = 0, for the upper right corner I did 9 - I1(1) - I1(8) = 0. I came to I1 =1, I2 =2 and I3 = .2. This was incorrect, I don't think I am summing the currents...
In my lecture, it was explained that Kirchhoff's Rule is used when circuits are too "complicated" to simplify by combining resistances in series and parallel.
I do not understand in which cases I can simplify circuits by combining resistances, and on which cases I can only use Kirchoff's Rule...
Naturally there are vector equivalents of the Kirchhoff Integral. Taken from Jackson (10.113)
##\vec{E} \left( \vec{r} \right) = \frac{ie^{ikr}}{r} a^2 E_0 \cos \alpha \left( \vec{k} \times \vec{\epsilon}_2 \right) \frac{J_1 \left( \sin \theta \right)}{\sin \theta}##Where I just let ##\alpha =...
I tried to solve it by loop currents. So on the left mesh the loop current ##I_1## goes clockwise and on the right mesh the loop current ##I_2## goes counterclockwise.
I ended up with the following equations:
1) ##V_1-R_1(I_1+I_2)-R_2I_1=0##;
2) ##V_2-R_3I_2-R_1(I_1+I_2)=0##.
To find the...
A sketch of the setup and the equivalent circuit are attached.
I believe the correct way to solve this is to redraw the circuit as shown in Fig. 3 and then remove the connections between evidently equipotential points, which reduces the problem to a familiar setup of in parallel and in series...
I would like to model the dynamics of a plate. Is it ok to use just the 2d wave equation if the plate will be under tension and fixed at the boundaries? I am a bit confused what the point of the Kirchhoff plate equation is in that case, is it for when the plate is self supporting? Many thanks
Homework Statement
In the circuit of the figure, determine the intensities I1, I2, I3, I4, I5 and the voltage Ug.
Homework Equations
Superposition and Kirchoff
The Attempt at a Solution
20-10I1+5I3-10I1=0
5I3+Ug+5I5=0
20I2+10I2-150=0
From the last equation, 30I2 = 150, I2 = 5 A
KNOTS...
Hi, this is my first time posting, I'm glad there is a space like this where we can share our doubts and hopefully get some help from other students.
As you can see on the image above, there's a KVL applied to the circuit in practice problem 2.6, but my question is the following:
On equation...
Homework Statement
I've recently watched a video which explains Kirchhoff's first law however, I'm not sure about his calculations. I got the same answer just wanting to make sure I am doing it right. the guy wrote L1: -75I2 +3V=0 ⇒ I2= -3/-75=0.04A
He calculated L2 like -12V -125I3 +75I2=0 ⇒...
Consider the Kirkoff integral theorem and the Huygens -Fresnel principle/formula (both from Wikipedia):
KIT
The Kirchoff integral for monochromatic wave is:
$$U({\mathbf {r}})={\frac {1}{4\pi }}\int _{S'}\left[U{\frac {\partial }{\partial {\hat {{\mathbf {n}}}}}}\left({\frac...
Homework Statement
I need to write Kirchhoff rues for the following circuit. This is not for a physics class, but for a programming class. I can do that part, but I am not sure if the equations are correct.
Homework Equations
The Attempt at a Solution
V1-I1*R1-(I1-I2)R3-I1*R2=0...
Homework Statement
The fresnel-kirchhoff diffraction formula could explain diffraction,I think it should also produce the result with relatively small wavelength and large width slit in which case there is no diffraction.
Homework Equations...
Homework Statement
Above is the circuit I have to deal with. We are given the Vin = 6V, Vout = 3.367 V and all the R values. We are asked to find the remaining values (The I's and V's)
Homework Equations
[/B]
Kirchhoff Voltage and current laws
V = IR
R's in series add
Voltage from a source...
1. Homework Statement
The circuit is driven by a voltage source,
Vs(t)= 8.2 cos(1.8 t − 0.25 )V .
The circuit elements are given as follows.
G1= 5 S,G2= 7.6 S,G3=3.8 S
(Gi is the conductance of corresponding resistor Ri)
L1= 20 H,C1= 5×10−2 F
If we select Node 4 as the reference node...
Homework Statement
Homework Equations
Kirchhoff;s first and second law, V=IR
The Attempt at a Solution
Tried the question as follows:
V= 24/(2+6+4)
= 24/12 = 2V (pd from top cell)
then did 2=4 I3
therefore I3 = 0.5A
and then 2 = 6I2
I2 = 0.33A
and I1 = 0.5+0.33...
=0.83A?
Homework Statement
Calculate the equivalent capacity of the capacitor system between points ##x## and ##y##
Homework Equations
##C=q/V##
The Attempt at a Solution
I'm asking about this problem because I know how to calculate ##V_x-V_y##, but I don't know how can I extract the equivalent...
hello, collegues,
I need to calculate current on the right circuit, but I don't really know how.
I have the current in left circuit I and L1 L2 C1 C2.
I have tried to calculate this using impedance and ohms law. As Z2=Xc+XL, and U2=jwM, where M - mutual inductance
I think that I2 should be...
Homework Statement
(a) In the circuit shown below E is a cell of source (internal) resistance r and the resistance of R is 4.0 Ω. With the switch S open, the high resistance voltmeter reads 10.0 V and with S closed the voltmeter reads 8.0 V. Show that r = 1.0 Ω.
(b) If R were replaced by a...
Hi Guys
Studying thermal radiation here and I am kinda stuck at one point
Kirchhoff law states that at thermodynamical equilibrium, the amount of energy absorbed must be reemited.
But before the system reaches equilibrium, is there a model to predict how much energy of these photons absorbed...
Hello! I am bit confused about kirchhoffs law with capacitors. So if I have a battery and resistance, I obtain V-RI=0. But from what I read, if I have a capacitor and resistance (so discharging capacitor), the equation reads
R(dq/dt) + q/c = 0, which is equivalent to RI + q/c =0. Why in this...
Hi Guys
I´m studying the absorption and emission phenomena of a gas and, according to Kirchhoff "extended" law, for a body at thermodynamic equilibrium, the following statement is true.
ελ(T,θ,φ) = Aλ(T, θ,φ).
So, if i understood correctly the meaning of this equation, The amount of absorbed...
Homework Statement
I attatched my question as a picture
Homework EquationsThe Attempt at a Solution
1.i found a solution using kirchhoff law, V1=-11V,V2=-9V
and it was correct. but i`m not sure that my method was right.
i know that kirchhoff law is originated from charge and energy...
I've read the derivation of Kirchhoff's formula for three dimensional wave equation using the Euler-Poisson-Darboux equation. The derivation seems to be fine, but I thought that the Kirchhoff's formula as a final result is a kind of result that you should be able to verify it by substituting it...
Homework Statement
Given a battery with voltage 35.7 V and 4 Resistors (Top left with resistance 2R, and the 3 others each with resistance R) where R = 507 Ohms, what current would an ideal ammeter read in its current position? (Diagram attached)
Homework Equations
Kirchoff's Laws: KCL and...
A 5μF capacitor is connected in parallel with a 2MΩ resistor and the combination is then connected in series with a 1MΩ resistor through a switch to a 12V battery. Find the time taken for the voltage across the capacitor to rise from zero initial value to 2V after the switch is closed.From what...
Homework Statement
Hi, I'm learning about Kirchhoff's laws, and have to solve the circuit. Attached picture of part the circuit I am attempting to solve. The ammeter reads 2 A.
Homework Equations
Kirchhoff's voltage law says the total voltage around a closed loop must be zero.
The Attempt at...
Homework Statement
The ammeter reads 5.0A. Find I1, I2, and ε
Homework Equations
ΔV=IR
The Attempt at a Solution
I've never dealt with ammeters before so I'm very confused.
To start, I tried breaking this into loops, and then used Kirchhoff's Law.
I started with the left side, since I...
In common test books the "proof" is usually use an example of a simple one-loop system with battery and resistor. In such a case, the current actually goes round the loop and the same current flows throughout the loop.
However in actual case, there may be different currents in different...
Homework Statement
[/B]
Consider the circuit above. You are given the following measured values:
V = 1.5 V
R1 = 100
R2 = 100
R3 = 50
R4 = 50
R5 = 50
Homework Equations
Kirchhoff's Loop Rule and Junction Rule
The Attempt at a Solution
I tried setting this up using the junction and loop...
Homework Statement
Find the effective resistance between the points 'x' and 'y'. When the middle Resistance is 5 ohms.
Homework Equations
Ohm's Law - V=IR. Kirchhoff's Junction and Loop (Mesh) Rule.
The Attempt at a Solution
I drew the following diagram:
I got the correct answer when I...
Though I understand the basic combinations of resistors, emf and capacitors, both in parallel and series, complex circuitry questions always baffles me. I would like to know what are the key points? I mean important points to be kept in mind. What are the common mistakes? What are certain tricks...
Homework Statement
I got questions a) and b), but I'm stuck at c) and d).
Homework Equations
Kirchhoff's Loop and Junction rules.
Equivalent resistance in series: Req = R1 + R2
Equivalent resistance in parallel: Req = ((R1)-1 + (R2)-1)-1
The Attempt at a Solution
I really haven't gotten...
Homework Statement
Find the current in each resistor of this circuit.
Homework Equations
Kirchoff's Current Law
The Attempt at a Solution
I just need a nudge in the right direction. I am fairly sure Kirchoff's Current Law comes into play, and have counted 6 loops and 4...
Homework Statement
Find I1, I2, I3
http://i58.tinypic.com/hwg4y0.png
(Problem included in image)
Homework Equations
Junction Rule, Kirchhoff, Ohms Law
The Attempt at a Solution
I don't understand Kirchhoff at all. All i got was I2=I1+I3 and I think that might be wrong.
http://postimg.org/image/mk8vo32in/
Just wondering whether the 3A from the current source should be included when writing a KCL equation for nodes a and c,
and if yes, why the full 3A? Wouldn't it split up along the way
thanks
Homework Statement
Find Kirchoff's laws for this
http://postimg.org/image/d78dvdg5f/
(Actual problem has a bit more but I can do that part.)Homework Equations
Loop rule
Junction ruleThe Attempt at a Solution
I got the following equations
2e - 4i_4 - 2i_2 = 0
e - 3i_3 - i_1 = 0
e - 4i_4 -...
When applying Kirchhoff's transformation to heat conduction PDE with temperature dependent thermophysical properties (k,ρ , Cp) , one obtains a transformed energy variable
u=∫Cp(τ) dτ and a term for a thermal diffusivity (α=k/ρ*Cp), thus reducing the nonlinerarity of the equation. When...
Homework Statement
Revered Members,
Please go through my attachment. I have been asked to find the magnitude and direction of current through the 10 ohm resistor. The answer that is given in the book is 1/23 Ampere from A to B.
But i solved as given in the attachment but i got the answer...
Hi,
Ive trying to work through Kirchhoffs voltage and current laws.
Ive so far calculated:
Current in Loop one (I1): 3 Amps going anticlockwise
Current in Loop Two (I2): 4 amps going anticlockwise
Current in Loop Three (I3): 8 amps going anticlockwise
R1: 5 amps going up = (Current...
Homework Statement
I'm doing a lab report and the last question is, how would your measurements (currents and voltages across each resistor) be affected if the resistance of the wires is 0.01 Ω and the internal resistance of the voltmeter is 10 MΩ?
Homework Equations
The Attempt at a...
Homework Statement
my work
I know part A is incorrect because for my part B my quadratic contains an imaginary,which I doubt he would due. Some help would be awesome since it is due tomorrow, and will probably be on the exam as well.
Homework Statement
Find current flowing through E1 ( find I1).
Homework Equations
I see 6 currents, atleast until the capacitor is charged, what i find confusing are the branches without any resistance and they seem to mess up my equations.
The Attempt at a Solution
1st kirchhoff's law...
Please help me!
I can't understand how to get equation of Kirchhoff to this scheme.
Thank you!
http://i5.pixs.ru/storage/4/3/0/shemaJPG_8094561_3553430.jpg
What is the correct way to pronounce "Kirchhoff"?
What is the correct way to pronounce "Kirchhoff"? I keep hearing the same two pronunciations over and over:
#1 sounds like KIRK HOFF (the preferred pronunciation of the prof who instructed my E&M class)
#2 sounds like KEER SHOFF
Which...
hi everyone,
please i need urgent help. in the attached image if R=1 ohm is traverse from b to H, why is potential change taken as -ive. the point H is close to +ive terminal of 5V power supply so it could also be a positive potential when traversing from b to H? please help me. hope you...
hi everyone
this is about the example 26.4 in attached pdf. I'm having problem in conceptual understanding of kirchhoff's loop rule. I'm total beginner in physics. in the example 12v battery is used to feed the entire circuit, primarily to recharge the run-down battery. please see the...