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.

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Interpretation of Generation and load power at a bus and understanding of slack bus

I was going through the IEEE 14 bus system data from [here] (https://ijireeice.com/wp-content/uploads/2013/03/IJIREEICE2E-a-shkti-Computation-of-final-21.6.14.pdf). I know that there are three type of ...
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What does power balance and voltage balance of a circuit tell? How to calculate them? [closed]

What information does power balance and voltage balance of an electrical circuit give about that circuit? What is the general procedure to calculate them? Are there any automated tools in which we ...
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Current Direction and Voltage Polarity in Capacitor/Inductor Circuits

I believe that this question may be simple for those with a little more experience, but it is still puzzling me. Studying capacitance/inductance, I understand that the capacitor in the DC case behaves ...
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How do I find Vo in the circuit?

I1 + I2 = I3 I1 = Vi/Z1 ... Z1 = (1+sCR1)/sC I1= Vi(sC)/(1+sCR1) I2= Vi/R1 I3= -Vo/R1 I1 + I2 = I3 Vi[(sc)/(1+sCR1) + (1/R1)] =-Vo/R1 -Vi[(R1sC)/(1+sCR1) + 1] = Vo How do I change back to time domain?
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State-Space Model of Resonant Circuit

I am trying to determine the state-space model of the circuit shown below. Also shown are the KH equations. Those equations I put in a Solver (Mathcad), however the result does not seem correct. For ...
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Op-Amp nodal analysis

Why is i20 = (Va-Vb)/20k, not Va/20k?
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Is it normal that an analog voltmeter has about 7K ohm input impedance?

I have bought 10V 6c2 DC analog voltmeter, and I have tested it with a regulated DC power supply and it measured pretty accurately different voltages, however when I tried measuring the voltages in a ...
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Adding ground to the minus of the source

I'm currently learning Kirchhoff's law and a circuit shown in the picture came up. I had tested it in a circuit simulator and no current was shown to leak to the groud. Could anyone explain what ...
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Using mesh current method find current and power in 15 Ω and 3 Ω resistor branches of the circuit

I assumed i1 in the left-most mesh, i2 in the right-most mesh and i3 in the top mesh, all clockwise. i2=-2 A from the circuit The equations I got were: from left mesh: 11 - 14 i1 + 12 i2 + 2 i3 = 0 ...
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Temperature gradients and different types of wires in thermocouples

I use long (10-m) copper-constantan thermocouples for work to measure temperature. The temperature gradient is only present in the 15 cm nearest the hot junction; the remaining 9.85 m of these ...
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Where do I apply KVL in this given circuit? [closed]

I would like to solve for the unknown voltage and current $V_x$ and $I_x$. Below is the image of the circuit. Should I first solve the current flowing in resistors 3 and 4 through equations of KVL ...
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How do I do KVL on the Input Loop of this Transistor?

The 200Ohm resistor is throwing me off. Is it supposed to be 200Ie, or 200Ib when I do KVL? I have tried simulating the circuit, but that does not alleviate my confusion. Ultimately, I am trying to ...
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How to determine two unknown voltage sources

I have this question from my electrical circuits class that i can't get my head around at all. Any help would be appreciated. On the left there is a voltage source of unknown polarity and voltage (...
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Find current and voltage through the circuit

Solve using KVL and KCL and find voltages and currents. For this I took $$i_1=i_2+i_3$$ $$v_1=2i_1$$ $$v_2=8i_2$$ $$v_3=4i_3$$ The equations I got by assuming loop 1 and loop 2 were $$5i_2 + i_3 = 5$$...
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How does KVL work in this circuit?

I am working through my textbook and came across a KVL scenario that I don't understand. In the problem we were tasked to find the current $i_x$ with node voltages. I can follow the solution that is ...
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KCL Equation question

Hi I was wondering why the i_A is negative in the answer in the photo, it was the only one that ended up not being right when I did the KCL on my own, what would have been my mistake as to why I ended ...
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How to do mesh analysis when 2 mesh are sharing the same voltage?

I was doing superposition theorem and trying new numericals and then I came across this problem..should I write "9 volts or 9(IsubA-IsubB)" in mesh 1?
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Nodal Analysis - Kirchoffs Current Law

Hello, I am stumbling across an issue here. So in Nodal Analysis, we identify our reference point and label the voltage nodes. Then we use KCL to find out equations and solve. My book is providing an ...
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Hello everyone, I am understanding the concept of mesh analysis and super meshes. In the Practice problem below, I am presented with a dependent current source and it lies between mesh 2 and mesh 3. ...
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Thévenin's theorem exercise

I tried to do an exercise from my textbook where I have to apply the Thevenin theorem, but can't solve it. I got stuck at one point. Given the circuit in the picture find the V0, Vth and Rth. I tried ...
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How do I solve this simple circuit using Kirchoff's Laws?

I am a freshman taking up Electronics Engineering and I am brushing up my skills in doing some simple circuit analysis problems. However, I've come across this quite simple problem and my answer is ...
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Using current division to find voltage

I'm a beginner in electrical engineering. I am having trouble with this circuit analysis problem. It asks to simplify the circuit into an expression for $V_L$ in terms of $R, R_L,$ and $i_S$. ...
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Big confusion about the very fundamentals of circuit analysis

First, let's call IR3 the current flowing from A to B, IR4 the current flowing from B to C, IR5 the current flowing from C to (-V2). What's the proof that IR3>0, IR4>0 and IR5>0? I know this ...
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Is there any way to simplify this circuit? [closed]

I am trying to get the Voltage across R2, R5. Could someone explain with detailed steps? Thanks
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Joining two parallel branches with a wire

In the above circuit (grounding the negative terminal of the battery,) will the potential at C and D be the same? According to my physics teacher, the potential is the same at the two points. Why is ...
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Why is $V_o=-V_c$ in this circuit?

Why is $V_o=-V_c$ in this circuit? Is it a derivation from Kirchhoff's voltage law? simulate this circuit – Schematic created using CircuitLab
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How to handle four resistors in a square (OP-amp)?

I want to analyze this circuit and find $\frac{V_{out}}{V_{in}}$. But how should I handle the four resistors in the square? simulate this circuit – Schematic created using CircuitLab Can I ...
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How can I determine the direction of current and how many different currents there are?

Whenever there are circuits with many batteries in parallel I get confused and I don't k now the direction of each current or whether it's the same current flowing or another.
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Why is $V_a=-V_b$ in this op-amp?

I can solve this circuit with nodal analysis, however, why is $$V_a=-V_b$$ in this ideal op-amp? Can I find this relationship from Kirchhoff's voltage law? simulate this circuit – Schematic ...
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I have the following op-amp circuit: simulate this circuit – Schematic created using CircuitLab I know that $\text{V}_1=0$ and $\text{V}_3=0$ in the case of an ideal op-amp circuit. I wrote ...