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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.

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Does KVL guarantee identical voltages/currents in similar circuits?

I have a question that is a bit abstract. Assuming I have two proper linear circuits, A and B, which have: The same ideal components (for example, voltage source, inductor, capacitor, resistor) The ...
hana's user avatar
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Is it correct to apply KVL through the 2 inputs of an op amp?

The question asks; "P14.25 Analyze each of the ideal-op-amp circuits shown in Figure P14.25 to find expressions for 𝑖𝑜. The top part is the question, the bottom is the solution from the ...
Nitai Michalski's user avatar
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KVL and KCL for an RLC circuit

I have a circuit for a resistor \$ R \$, inductor \$ L \$, capacitor \$ C \$. I also have two sources of power, \$ u_1(t) \$ and \$ u_2 \$. My task is to set up a state equation for the circuit, and I ...
ganesh1102's user avatar
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2 answers
135 views

Application of Kirchhoff's voltage law to a section of a circuit

I have to write an equation for calculating value of current on the circuit section. Let's say that direction of bypassing the circuit was chosen the same as direction of current on the figure. I ...
Artur Krush's user avatar
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2 answers
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I am analyzing this circuit using KVL

I am analysing this circuit using KVL. My doubt is while writing the loop equation what will be correct format. $$ 70-V_x - 2V_x- V_o =0 \: \: \: \text{or} \: \: \: 70-V_x-2V_x + V_o = 0$$ Please ...
Bhavesh Panwar's user avatar
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Using Kirchhoff's voltage law for calculating S-parameters

Consider the following circuit: for which I'd like to calculate the S-parameters of the impedance \$Z\$ (and assuming \$Z_G\$ = \$Z_L\$ = \$Z_0\$). Will it be correct to use the Kirchhoff's voltage ...
Curious's user avatar
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Negative current flow contradiction?

Does negative current mean the flow of negative charges? If so where do the positive charges from I_1 and I_3 go after reaching the blue node on the image below? I do not understand how the positive ...
Sandvall's user avatar
2 votes
1 answer
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Finding Thevenin voltage and resistance [closed]

I am struggling to find the Thevenin voltage and resistance across terminals A and B of the given circuit. I got as far as writing KCL at nodes 2 and 3, which gave this: $$v_\text{AB} = - G_2/G_1 e + ...
Diavo's user avatar
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Would a current pass in a resistless wire, like a superconducting one, when its ends are connected to the terminals of an ideal battery?

Would a current pass in a superconducting wire, when its ends are connected to the terminals of an ideal battery? If the answer is yes, wouldn't that violate KVL because the voltage rise in the source ...
Jack's user avatar
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MCAT resistor question

Example: Consider two resistors wired in parallel with R1 = 5Ω and R2 = 10Ω. If the voltage across them is 10 V, what is the current through each of the two resistors? Solution: First, the current ...
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Resolving this circuit diagram

I feel like I'm missing something really basic here, but why wouldn't V1 have any impact on the voltage at V3 in this diagram?
BuiltDiff's user avatar
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How does Kirchhoff's current law take resistance into consideration? [closed]

I just drew a small diagram on what I mean. Based on Kirchhoff's current law, in a junction, the current entering a junction must equal to the current leaving the junction. In the picture the ...
Gergő Horváth's user avatar
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1 answer
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How to formulate an equation for the electrical circuit with both a voltage and a current source?

This problem asks me to find Rx, the electrical power of each element and the algebraic sum of the electrical powers of all elements. How to apply Kirchhoff's and Ohm's law correctly in this problem? ...
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How to calculate current limiter resistor when voltage regulator is involved?

I'm designing my first PCB and I'm not sure if the diagram I found on a datasheet is complete. For what I have read, there should be a resistor between R1 and the transistor Tr1. I have followed this ...
Waripolazo's user avatar
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How to calculate the value of resistor R2?

How to find the value of R2 in this circuit? If I1 is 8 mA in this case (I = I1 + I2) and then given 5 V over R2 and R3, 5 V/0.008 A = 625 Ω. Is this answer valid ? Or is it 5 V/I = 2mA = 2.5 = 1/2.5 +...
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What are the currents and the power dissipated by the load \$R_{T}\$ in the following circuit

The circuit has 2 voltage sources one of which is 0.5UR2, one current source, resistor elements R1 & R2, the load is RT 10 ohms. Having the following circuit, I have used the Kirchhoff's circuit ...
Chum Chum's user avatar
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Energy stored in a magnetically coupled circuit

In the circuit shown, inductors $$L_1,L_2$$ are magnetically coupled with the mutual inductance being $$M$$. The red dots are for dot convention. Normally,the energy stored in such a circuit is $$\...
green_blue's user avatar
2 votes
2 answers
104 views

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 ...
Clueless's user avatar
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3 answers
102 views

DC circuit and capacitor

What method should I use to calculate the voltage across C1 and C2 in the following circuit in DC conditions? I've already tried using KCL, but I'm confused with what point on the circuit to use. Is ...
Agatha Hadasa's user avatar
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2 answers
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How to perform Kirchhoff's Voltage Law on an open circuit? [closed]

I am wondering how to perform KVL on an open circuit. For V_s = 10V, I have determined the V across R2 to be 10 Ohms but am confused about R3. The algebraic sum of the voltages around any closed loop ...
9_daytona's user avatar
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Confused about usage of Ohm's law & Kirchhoff's laws to solve a circuit

I'm solving this circuit using Ohm's law and Kirchhoff's laws: I solved the circuit correctly the second time. Equation A: $$I_1-I_0-6=0$$ Equation B: $$-120\ \mathrm{V}+I_0\cdot 10+I_1\cdot 50 = 0$$ ...
cherry's user avatar
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Is it correct to generalize Kirchoff's current law to areas?

I'm very new at learning electronics, and I came across KCL. I think I understand it, I've used it to solve problems, and it makes sense to me (it feels very much like conservation laws in mechanics, ...
Daniel F. Moisset's user avatar
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1 answer
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KVL on circuit with transistor

I have a question regarding applying KVL in a circuit with a npn-transistor. Unfortunately this is badly documented in the textbook, and I couldn't find the answer so far. For the circuit below, it ...
LLScheme's user avatar
4 votes
3 answers
690 views

Why does this op-amp circuit show current flowing like that?

This image shows an op-amp being powered. Is there any reason why it shows current flowing from the negative side of the bottom battery into the op-amp or why it shows current flowing from the ...
Analysis101's user avatar
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2 answers
74 views

Doubt in applying KVL

I want to apply KVL to loops abcda and befcb in the circuit given below. Is there any role of the 2A current source in those two loops, that I need to consider before applying KVL?
Sagar K. Biswal's user avatar
2 votes
2 answers
165 views

How can there be no Thévenin voltage with only a dependent voltage source? [closed]

I don't understand why the Thévenin equivalent is equal to zero in this case because, if the load is a resistance, then yes, the circuit would be dead as there would be no voltage drop across Vx. But ...
Analysis101's user avatar
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1 answer
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Example 3.17: find Vo in a circuit containing a voltage controlled voltage source

Trying to solve this circuit using mesh analysis. However, I am having trouble understanding why Vx = 4kI1 specifically why to go through the 4k resistor using current I1, my intuition wants to set Vx ...
Raquel's user avatar
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Including resistance between supernodes

Here,as per the circuit,we can take \$V_1\$ and \$V_3\$ with the voltage source across them as a supernode(as the area marked in red). In the red marked portion i.e supernode,we see that current can ...
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Find Vs and the power supplied by the 10V source [duplicate]

I am stuck on this textbook problem where the chapter is about Kirchhoff's Laws (Ohms, KCL, KVL, Voltage Division, Current Division, Wye-Delta, and lastly Dependent Sources). The chapter does not ...
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1 answer
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A student who should know how to do this, kirchhoff's edition [closed]

We know that the voltage of the volt meter gives 2V and the ammeter is 2A. We must find I1 and I2, and I'm at a loss as to what the voltage can be used for. Especially considering the correction of ...
Emmannuelle_Legolas's user avatar
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1 answer
99 views

Special case nodal analysis

I tried to calculate, but I'm quite confused to go further. The calculations can be seen in the image itself. This is a special case, nodal analysis with special dependent voltage source branch. How ...
Fredrick's user avatar
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1 answer
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Special case of nodal analysis

In this diagram, we see node V2, I can understand how it can be treated as a node. But I don't understand in the equation how \$-v2(0)\$ comes. I thought maybe the R for short circuit is 0, then also ...
Fredrick's user avatar
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5 votes
3 answers
486 views

Circuit theory basic problem

What approach do I have to take to find Vs. I don't really want an answer to this question but I want to know how to solve these circuits. I'll first tell the approach I tried. I took KVL for all the ...
Fredrick's user avatar
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1 vote
2 answers
137 views

Determining Thévenin voltage using nodal analysis

Here I want to determine \$V_{th}\$ without using mesh analysis and just by using nodal analysis. Now, \$V_{th}\$ is the same as the voltage across the \$6\ \Omega\$ resistor since no current passes ...
a_i_r's user avatar
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1 vote
2 answers
119 views

Voltage distribution with two batteries [closed]

I have a question regarding a simple circuit of two batteries (9V) in series with a single resistor connected to the outer contacts to prevent a short. When I'm simulating this circuit, a current also ...
olympus_mons's user avatar
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1 answer
91 views

Find Thevenin's voltage

How could I find Thevenin's voltage in this circuit? I can't use KVL since i don't know the voltage rise of the current source after removing the load.
Serkratos121's user avatar
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1 answer
129 views

Two-port network

I have been trying to solve a problem on two-port network but I am getting two different answers: APPROACH 1: In the problem the Y-Parameter is given so I converted Y parameters to H parameters and ...
Preet's user avatar
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Can an RCL circuit be asymptotically unstable? If so, what does that mean physically?

I'm analyzing the asymptotic stability of the system of ODEs that comes from an RCL circuit in series. Below is my circuit, with battery voltage \$u(t)\$, resistor with constant \$R>0\$, capacitor ...
travelingbones's user avatar
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1 answer
184 views

Voltage generation using 4 LEDs in series. Why does the voltage drop if I add a 5th LED in series?

I am making a device that doesn't use any batteries or outlet power. I need it to momentarily (<1 s) produce 5V DC or more after a bright light is applied to a hole with a 10 mm diameter. Due to ...
manubrio's user avatar
4 votes
4 answers
307 views

Calculations of mesh and nodal analysis of my dc circuit doesnt satisfy any of the KVL or KCL conditions

So I'm working on a course project under my professor and I seem to have encountered a huge problem. I built my own circuit and solved it using mesh and nodal analysis in MATLAB, got some values but ...
SpaciousCoder78's user avatar
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1 answer
34 views

Amplifier circuit: Voltage divider x KCL

I was checking the solution to one question when I found out I couldn't use voltage divider rule to easy the formulas, the amplofier circuit (infinite gain): My first attempt: $$ V_{x}=\frac{R_4}{R_1+...
Duca's user avatar
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1 vote
1 answer
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How do you use nodal analysis to this circuit?

By using mesh analysis I have 4 equations: 6ia - 2ib = 24 -2ia + 12ib -20ic - 2id = 0 -8ib + 12ic = 0 -2ib + 12ic + 3id = 0 Got ic = 8/3 A, so Vo = 4(8/3) = 32/3 V ; correct me if I'm wrong But I don'...
New student's user avatar
0 votes
2 answers
204 views

Simplifying a circuit for nodal analysis [closed]

I am trying to simplify/classify the following circuit: My textbook says it is a four-node circuit but I am coming up with 3 nodes. Doesn't the "Ref." dot and the rightmost dot combine into ...
kote's user avatar
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0 votes
1 answer
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Circuit reduction: Voltage across terminals [closed]

I'm new to electrical engineering and there is debate in my class about a problem. We are asked to find the voltage across A and B after reducing the circuit. Circuit is symmetrical. Information given:...
Kamalakshi's user avatar
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1 answer
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How to determine the directions of voltages across resistors in circuit diagrams?

In the following diagram, the directions of both currents and voltages for voltage sources are shown. My task is to write KCL and KVL for all 3 loops, and my question concerns KVL. I believe I am ...
Nare Avetisyan's user avatar
2 votes
5 answers
338 views

Does current prefer to take a series path over a parallel path?

simulate this circuit – Schematic created using CircuitLab Based on the simulation I have done, current here prefers to take the C1 - R2 path first and once C1 is saturated and cuts off it then ...
Dan's user avatar
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1 answer
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Is there a sequence of thought I can do to solve complex circuits using only KVL and KCL?

This question took me a good 20-30mins of solving, and this just feels like a long time especially when I take my midterm exam it will only be 2 circuits in 1 hour only, so I need to make sure I find ...
Ahmed Soliman's user avatar
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1 answer
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How does the current direction affect KVL?

I'm a bit confused about using KVL on circuits. For example, suppose I have this circuit, and we are given the direction of inductors current and capacitors current, and we have to find VA. Using the ...
Rose Haze's user avatar
1 vote
0 answers
70 views

Current constant circuit

Did this circuit ok since no resistor on circuit? the voltage for each led is 3V for each led. Did i need to add resistor since 3Vx7=21V. The diode is led driver for 15mA. Btw, I'm designed for ...
Kim's user avatar
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0 votes
3 answers
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KCL confusion about currents direction

Sometimes when I use KCL for nodes in a circuit I cannot correctly determine the direction of the currents. My book also says that according to KCL the algebraic sum of currents entering a node is ...
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