# Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.

2,987 questions
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### If we have four grounded nodes in a circuit, can we connect two of them together and forget that those two were grounds?

Refer to the image attached. I personally think the answer is no because it is not necessary for the currents through both the grounded capacitors to be the same in the upper circuit, but that is not ...
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### Finding the Transfer Function of Spring Mass Damper System

I have been going through Ogata Modern Control Engineering book and working through several exercises to improve my understanding of basic control principles. I came across the following example which ...
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### i don't understand the KVL solution to this question?

this is part of the solution of a previous exam and there are some things i don't understand about it 1- why did he assume the value of current at the 12 Ohm resistor to be 0.5A without any ...
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### Finding necessary voltage for diode conduction

simulate this circuit – Schematic created using CircuitLab In the following, I need to find $V_a(v_{in})$ such that $D_3$ is on. Assume a forward voltage drop of $0.7V$. From past ...
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### Solution of Linear Electrical Circuit

We learned in class that the number of independent KCL equations is N-1(N-number of nodes) and the number of independent KVL equations is B-(N-1) (B- number of branches). Thus we have B independent ...
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### Flow of electrons

I feel like this is an extremely stupid question, but I am not from electronics! In diagrams, they use conventional current. If I were to make this circuit in real life connecting battery + with diode ...
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### How to measure collector current in BJT?

In the following circuit: I know the expression for the collector current is $$I_C =\frac{V_{CC}-V_C}{R_L}$$ Say I have a potentiometer for $R_L$ and I decide to set it to 0 Ω. What would $I_C$ ...
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### Does a discharging capacitor in an AC circuit add additional voltage to circuit?

In an RC circuit with an ac voltage source, after the capacitor becomes charged and then the sign of the ac voltage flips, does the discharging capacitor add additional voltage to the circuit compared ...
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### How to calculate the voltage gain in this picture?

simulate this circuit – Schematic created using CircuitLab I know that by using $A_v=-G_mR_{out}$, and $G_m=\frac{I_{out}}{V_{in}}$, we can get the voltage gain of this circuit. After the ...
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### How do I determine the purpose of this op-amp circuit?

I have this circuit and I was asked to determine V2=f(V1) and V3=f(V2) which I determined below. The next step is to figure out what the purpose of this circuit is but I'm not sure how to do it from ...
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### Removing/Subtracting Lead Resistance Using Op Amp Circuit

I'm working with RTD sensor, and need to use Op Amp circuitry. Can someone explain to me how this Op Amp circuit work to remove the lead resistance? So that Rw1, Rw2, and Rw3 vanish, hence the ...
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### Vo in an RLC circuit

So I have this RLC circuit: And its equations for voltage addition, current conservation, ohm's law and a solution of those equations (Vo). Then there's this RLC circuit: With another set of new ...
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### Understanding charge and discharge of a capacitor

I feel bad at this point. This will be my last post about it, however, I will explain myself more clearly and more transparent so everyone doesn't need to guess my issues. Never been so confused ...
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### Q: Finding the current through the capacitor

Having a hard time trying to find the current through the capacitor I don't know what method to use. simulate this circuit – Schematic created using CircuitLab This is how far I have gotten: ...
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### Moving Ground in between resistors in series

What happens when you move Ground to the given point? How does it affect the Voltage and the Resistors after moving it in the circuit? Missing values: .Current (I)= 30mA (V.R1)= 15V (V.R2)= 3.6V ...
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### Howcome there is current flowing through the gate of this transistor?

I have a few conceptual questions: If there wasn't Rg (Resistor between gate and drain), would Vin = Vout then? For small signal analysis, current can flow through the gate (AC) if there's a voltage ...
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### Integrator (Op amp) Simulation OrCAD

I'm working on in a integrator op amp and actually i make the desing in a breadboard and is working but in time of simulation is like there is not voltage in the output of the op amp. I don't ...
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### Where might the fault be in this battery checker circuit from an old camera? [closed]

I'm repairing an old rangefinder camera, a Canonet QL17 GIII. I have had to do a lot of internal rewiring. All is now working, except for the battery checker functionality. I've included that part of ...
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### Combining two ideal voltage sources with an impedance between them

Solving a problem, I came across the following source transformation:        My question is: I know that I can do the following:       &...
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### Calculating Thevenin voltage and Norton current for complicated circuit

I asked this question before in relation to calculating power before but it seems I might have not been clear enough. I'll draw the original circuit and then the circuits for calculating Thevenin and ...
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### Source transformation with impedance being inductor or capacitor

I found a presentation that states the following about source transformation when the impedance is capacitive/inductive: While electrical circuits books, like Nilsson's, says: If I transform the ...
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### Differentiator (Op amp) with a square wave

I'm working on a differentiator (op amp) with a unitary gain i calculated the value of RC and the period with a frequency of (1kHz). Figure 1. Differentiator Schematic (OrCAD). This is the schematic ...
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### Finding R for max power deliverable to R and determining the max power

This relates to max power transfer. Here's my circuit: simulate this circuit – Schematic created using CircuitLab My goal is to try and find the value of R for the maximum power that can be ...
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### calculated Voltage explanation

The blue highlighted values are the answers, but can sombody explain how my teacher got 120v for the 4k resistor and 60v for the 2k resistor? the only one I could figure out is the right side where I ...