# Questions tagged [kirchhoffs-laws]

Kirchhoff's circuit laws deal with the conservation of charge and energy in a circuit.

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### Can two voltmeters connected to the same terminals show different values? Circuit with induced EMF

The circuit shown below consists of two resistors connected in series that form a closed loop. No electrical sources are in that loop.Let’s assume that the resistance of the wires that connect the ...
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### Applying kirchoffs law in a simple circuit [closed]

Can we apply Kirchhoff's volatge law in this simple circuit and say V1=-r1I1 and V2=r2I2 or is there an other connection between voltages and currents?
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### Meaning of the three bars on a circuit and help regarding Kirchhoff's Laws

So i'm really lost and I have to solve some problems from circuits regarding mainly resistors. I have this circuit and I am a bit lost because I don't really understand what to do to find the value of ...
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### Kirchhoff's laws in an open circuit

I am currently struggling with the following homework problem: It asks to find the voltage across the points a and b. I first redesigned the circuit to make it look for straightforward and I ...
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### How Does Kirchoff's Law Make Sense

I understand the algebra, and I can also use Kirchoff's Law in calculation. But I struggle to understand how it makes sense logically. The law states, that the sum of the currents entering a ...
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### Find all the Kirchhoff's circuit equations in a multiple batteries circuit [closed]

So I saw this exercise where it says to find all the currents that flow in the circuit and all the equations for the currents and voltages. Any help would be more than welcome]1
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### Converting a schematic to a graph [part 3]

This is part 3 in my journeys to try and graph a basic resistor circuit programmatically (part 1 and part 2. I think I have finally figured out how to treat components -- which if I looked at any ...
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### Determining gain, KCL/KWL (Basics)

Below is a pi model schematic of a cascaded amplifier. The goal is to find the gain with Rp as load. So the gain would be: $A = \frac{V_{out}}{V_{in}}$. So i set out to find $V_{out}$ in terms ...
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### How do we know that current doesn't get “stuck” in junctions?

I know the question might sound slighly basic, but stay with me here. Kirchoff's Current Law states that "The algebraic sum of currents in a network of conductors meeting at a point is zero." ...
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### Converting a schematic to a graph

This is a follow up to the question about I posted last night, Converting a schematic into a graph. From some of the answer, I was able to re-work how the graph is done -- with components as edges and ...
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### Single phase neutral current & three-phase neutral current with respect to kirchhoff's law

In the below schematic, would be the sum of all current in the single phase neutral wires equal to the current in neutral wire going to the 3 phase main disconnect? In theory, we know that if the 3 ...
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### Converting a schematic into a graph

I've been working for some time trying to figure out how it might be possible to translate a schematic into something like a node graph, where each node is a component. I've taken some liberties in ...
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### Node analysis: estimating variable current branches

Is there a way to get the number of potential currents that could be in a circuit? (Note: in the following circuits ignore the Resistor value, I've just added a resistor with the default schematic ...
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### Verification of power law

Here is the solution that I have so far. How are the values of Vx different if we solve it using KVL and different if we use Ohms Law? And to verify the power law, do i need to calculate the ...
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### I need to verify the power law in this question

Question. I suppose the value of Vx must be positive. So how do I manipulate the equation such that Vx becomes positive? Can this be the solution to this question?
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### What exactly is this question asking us to do?

Based on the model and circuit shown in Fig. 2, draw a circuit model of the path of current through the human body for a person touching a voltage source with both hands who has both feet at the same ...
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### How do I calculate i, i1, i2 and v2?

I'm unable to figure out how to use the current dependant voltage source in KVL The following are the equations I've found, up till now: 20i+V2=10, V2=50i1, 20i+50i1=10, i=i1+i2
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### Solving for current with voltage drops

Given the following circuit: Why is the current through the circuit 34.7mA instead of 35 mA? My thinking was that: The LED draws two volts, so it effectively makes the battery 7V instead of 9V. ...
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### the transconductance of cascade MOSFET IF channel length modulation is NOT ZERO

What would the derivation of the cascode MOSFET transconductance in small signal analysis IF THE CHANNEL LENGTH MODULATION IS NOT ZERO, as most examples for the cascode mosfet transconductance say in ...
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### Lumped model not applying to PCBs

Recently I have heard that KCL and KVL do not fully apply when performing electrical measurement on PCB traces. It was implied that PCBs are not completely lumped circuits - that is, we cannot assume ...
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### Reasoning behind equations in analysis of electrical circuit

I am currently studying the mathematics textbook Nonlinear Dynamics and Chaos by Strogatz. As part of an example, I am provided with the following electrical circuit and accompanying explanation: ...
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### Solving simple parallel/series without Req

Given the following circuit with three resistors, R1=100Ω, R2=200Ω, R3=300Ω: To solve this using the $R_{eq}$ trick: ...
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### Substitution + Superposition with RLC circuits

Consider the following circuit: simulate this circuit – Schematic created using CircuitLab $E$ is a constant voltage source. The switch is closed at time $t = 0$. The request is to ...
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### Number of independent KVL and KCL

I know that the number of KTL and KCL is related to the number of nodes $N$. For KCL there are $N-1$ equations while for the KTL there are $L-(N-1)=L-N+1$ equations. However I didn't understand ...