What is Kirchoff's voltage law: Definition and 30 Discussions
Kirchhoff's circuit laws are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits. They were first described in 1845 by German physicist Gustav Kirchhoff. This generalized the work of Georg Ohm and preceded the work of James Clerk Maxwell. Widely used in electrical engineering, they are also called Kirchhoff's rules or simply Kirchhoff's laws. These laws can be applied in time and frequency domains and form the basis for network analysis.
Both of Kirchhoff's laws can be understood as corollaries of Maxwell's equations in the low-frequency limit. They are accurate for DC circuits, and for AC circuits at frequencies where the wavelengths of electromagnetic radiation are very large compared to the circuits.
Hello,
I'm struggling with the conditions under which makes sense employ a two-port 'external' representation of a quadripole (four-terminal electrical network) when interconnected to an external circuit (to take it simple assume a linear + permanent electrical network).
Starting from circuit...
Homework Statement
The diagram below shows a circuit where; R1 = 5.0 Ω, R2 = 8.0 Ω, R3 = 1.0 Ω, V1 = 16.8 Volts, V2 = 1.5 Volts, and V3 = 39.6 Volts. What is the value of I1? In solving this problem, initially pick the current directions as shown. If the actual current turns out to be in the...
Homework Statement
Using Kirchhoff’s rules, (a) find the current in each
resistor shown in Figure P28.31 and (b) find the potential
difference between points c and f.[/B]Homework Equations
[/B]
Σ ΔV = 0 (KVL)
The Attempt at a Solution
[/B]
I have been trying to set up a system of equations...
Homework Statement
For a lab, we explored Kirchhoff's Laws. I made a procedural mistake while measuring my voltage values across my different elements. I know that all of my calculated voltage sums are correct, so I was wondering what I might have done to have loops ACBA and CDBC have almost...
Homework Statement
I need to find the currents I1 and I2 in the attached image, but am having some difficulties grasping the concepts. I am given E(t) = 338sin(t) as well as values for R, L and C. I think I know what I need to use but I am not sure how to put it all together
Homework Equations...
Hi all. In a project I'm working on I'm needing to model a DC circuit to find the required power sources/storage to keep the system voltages up to a sufficient level. There's a solar cell array, a reversible fuel cell stack, various DC "appliance" loads, and wire runs with resistances. I dug...
Homework Statement
What way does the current flow through the first light-bulb?
Homework EquationsThe Attempt at a Solution
This isn't really a homework question but related ot my school work. I'm doing Kirchoff's Laws and normally I would have just thought that the current (if we use...
Homework Statement
Homework Equations
The voltage between any two points due to the field from a point charge q is:
Kirchoff's voltage laws, which states that the total voltage around a closed loop must be zero, i.e.:
The Attempt at a Solution
To find V(e<-d) I used Kirchoff's...
Homework Statement
I must solve for the voltage across the resistor labelled R1 in the circuit above. The values given are the resistance of each resistor, the voltage of each voltage source and the current of the current source.
Note: If referring to circuit loops consider them as being...
Homework Statement
Here is the problem in question. The only values given are those shown on the circuit labels. We are asked to form a voltage equation using Kirchoff's voltage law with specific loops. We were NOT asked to solve the equations for the currents.
Homework Equations
Sum of...
Homework Statement : [/B]Given the circuit diagram, find the equivalent resistance between points P and Q. Homework Equations : [/B]ΔVloop = 0, ΔIjunction = 0 and V = IRThe Attempt at a Solution : [/B]Eliminating the wires with no resistors and solving for resistance gives me the answer as...
Homework Statement
Homework Equations
P = V^2 / R
1/Rt = sum(1/Ri) (parallel)
The Attempt at a Solution
[/B]
Since all the answer choices express the solution in terms of V^2 / R, I tried to find the voltage drop across resistor #2 to find the power. I collapsed the two parallel...
Homework Statement
Find the value of v1, v2, vab, vbc, vca. See picture
Homework Equations
Kirchoff's Law
The Attempt at a Solution
Is it true that both current through 3 and 4 ohm resistors are zero?
The way I think of this is if they aren't zero, there would be charge building up at a...
Homework Statement
Hello! I've been really unsure of whether my solutions to the first problem and part (b) of the second are right. My book gives few examples and so I've been trying to look on other websites for resources. Sorry if this is a lot, but any and all help would be appreciated...
Hello Guys
My Question about Kirchoff's Law is : why in this Example
we considered that E2 is a Voltage Drop not a Voltage Rise ??
i mean why we didn't say that : +E2-V1-V2+E2=0 ?
and Thanks Guys :)) !
There is an idea that Kirchoff's voltage law could not be applied to circuit containing coils like this link.
What makes me confused is that almost all books apply Kirchoff's voltage law to RL and RLC circuit.
Homework Statement
Differentiate V0 - iR - q/C = 0 to prove that di/dt = -i/RC.
Homework Equations
V0 - iR - q/C = 0
^ derived from previous question for a circuit that had one battery with emf V0, a resistor of resistance R and a capacitor of capacitance C (all in series).
di/dt =...
A simple electric circuit (such as one composed of a battery with Emf V and resistor with resistance R) is in an electrodynamic state since the battery's potential difference creates an electric field in the circuit's wires, which in turn moves charges around. So potential difference in wires is...
What is the voltage across vc(0) in the diagram below?
The solution says its 10V but I don't know how they got that.
Through KVL, I got 0V.
Since all the current flows through the left most circuit, iA = 10/1000 = .01A
3k and 1k(right) resistors have no current.
-10 + 1000iA + vc = 0
vc =...
Homework Statement
I am required to write KVL circuit equations for the following circuit
I don't need to finish solving for I1, I2, I3 and I4 at the moment. I just need a bit of help setting up the equations. Thanks.
Homework Equations
Kirchoff's Voltage Law, which states that...
N.B: I was trying to apply kirchoff’s voltage law to this ckt diagram. (created by myself :smile:)
To apply kirchoff’s voltage law:
1) Assume current along with their directions in each branch of the ckt.
(Assumed: and represented by arrows (red for I1 and violet for (I1 +...
Hi,
when summing the votages when using Kirchoff's voltage law around some loop, why do anywhere they take L(dI/dt) as the voltage fall on the inductance (if we sum the voltage in the current direction)?
If I understand well , if there is a current in some direction, the induced voltage...
a series circuit with an inductance of 15mH, a capacitance of 35*10^(-6) F and a resistance of 5 ohms conatain a sinusoidal source of emf with a frequency of 500Hz. The frequency with which the charge on the capacitor oscillates is?
i think that it should still be 500Hz, right?