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Questions tagged [kirchhoffs-laws]

Kirchhoff's circuit laws are important for circuit analysis. There are two laws: Kirchhoff's Current Law (KCL) and Kirchhoff's Voltage Law (KVL). KCL states that the sum of currents flowing into a node is zero, and KVL states that the directed sum of voltages around a closed loop is zero. Consider also using the "circuit-analysis" with this tag.

Kirchhoff's circuit laws are important for circuit analysis. There are two laws: Kirchhoff's Current Law (KCL) and Kirchhoff's Voltage Law (KVL). KCL states that the sum of currents flowing into a node is zero: $$\sum_{k=1}^n I_k = 0$$

KVL states that the directed sum of voltages around a closed loop is zero: $$\sum_{k=1}^n V_k = 0$$

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Explain kirchoff's law in Plain English

I'm having trouble in explaining kirchoff's laws to my cousin who is studying in first year Engineering. Can somebody explain me in simple plain english. Thank you very much in advance :)
pramodc84
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How many measurements are needed to determine a black box with four terminals?

I am having a black box with four terminals and just resistors inside. I can model it like this: simulate this circuit – Schematic created using CircuitLab If I have four different currents and four different potentials at the four different…
blablubbb
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Textbook's way of determining KVL polarities

The following example is taken from Fundamentals of Electronics (4th ed.): In the example there is a voltage source connected in series with two resistors. I've checked other questions [Ref] [Ref] and as I understand it, the polarity of the…
CantDoElectronics
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Determining currents in each part of the circuit using Kirchhoff 's laws

During this question I have applied the junction rule and the loop rule but I am stuck on the next stage: I1 = I2 + I3 Loop 1 and 2 will be both in the clockwise direction. Loop 1: 30 - 8·I1 - 6·I2 = 0 Loop 2: -3·I3 + 6·I2 = 0 Now here I am unsure…
AMN
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Mesh Analysis with a ideal current source

I have been reading up on network analysis techniques for an upcoming competition, and I was wondering if anyone could be so kind as to derive and explain the system of mesh equations required to solve the following problem: There is an ideal…
hedgepig
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How do I write KVL in this circuit?

I am studying this circuit in my course: AB is opened, E1 = E5 = 10V, E4 = 40V, R1 = 2 Ohm, R2 = 4 Ohm, R3 = 6 Ohm, R6 = 6 Ohm I want to write KVL for the Loop 1, what I do usually is defining the voltage drops polarity across each element…
Siraj Muhammad
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Is there a way to solve this circuit using superposition or KVL?

simulate this circuit – Schematic created using CircuitLab Using KVL : \$-1 + 100(I_a+I_b) = 0\$ \$-1 + 100(I_a+I_b) = 0\$ In both loops I get the same equation, so I cannot know how much current is drawn from each individual battery w/o using…
Hiiii
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Calculating the Resistance using Mesh-Current Method

In the figure, if I = 80 mA, determine the resistance R. simulate this circuit – Schematic created using CircuitLab Answer is 600Ohm. My Steps :…
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Learning loops, Kirchhoff's Laws

I'm trying to teach myself electronics from an old textbook, "Fundamentals of Electric Circuits", \$4\$th Edition, by Alexander and Sadiku. On page \$41\$, I can't figure out how they did example \$2.6.\$ See this diagram: So I'm applying KVL…
user29438
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Looking for intuition for KVL regarding parallel resistors

I'm completely new to electrical engineering. I came across KVL and my previous intuition about how voltage works broke down when coming across an example of KVL and parallel resistors. Some background: My understanding of voltage is that it is the…
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When does a circuit, containing only independent voltage and current sources, violate Kirchoff's law?

How do I know if the circuit below violates Kirchoff's law or not?
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How to suppose the current directions for KCL?

I know applying kcl but I dont know how to consider the directions of the current.What I do is I make a general current direction for the whole loop,then with the help of that I see the currents entrying the node or leaving it but I usually go wrong…
user1799
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voltage direction confusion

This may look notoriously trivial to ask. we can see the direction of electron flow as indicated in the picture. the down side of the arrow must be the positive side of the voltage drop in each resistor, so two positive voltages + v_be=0 it implies…
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kcl and kvl what is the difference

I am very confused in the terms of what is the actual difference between kcl and kvl? I don't want to have a question on a test and not know where to apply kcl and where to apply kvl? Please help and thanks in advance
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Calculate the current

I was practicing for the exam suddenly I found this question the professor solved, but I think whether he or I made a mistake. Part (III) in the image. His calculation is on the image he added the two current claiming that it is I of the source…
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