Questions tagged [circuit-analysis]

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

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4answers
510 views

Solving a circuit with a directional loop

I came up with the following circuit: Please disregard the labeled values in the diagram - the resistances are identical for the sake of simplicity, and of value \$R\$, and the voltage has value \$V\$...
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3answers
2k views

Nodal analysis for current controlled current source

Okay here I go. I just started learning nodal analysis technique but I feel its difficult in solving the circuits consisting of dependent current and voltage sources. Im unable to solve this circuit. ...
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3answers
3k views

Dirac Delta Impulse Response of series RC circuit (Voltage across the capacitor)

I have evaluated the transfer function of an \$RC\$ circuit, getting the following transfer function: $$H(s)= \frac{1}{1+sCR}$$ the impulse response (i.e. output response to a Dirac's Delta) would ...
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3answers
23k views

When to use Nodal Anaylsis / Mesh / Superposition?

I'm studying these three methods and i'm confused on exactly which one is used when. This is a very broad question. Therefore, could some explain in general terms the difference of the three methods ...
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3answers
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Node Analysis - current calculation

I have a cicuit here that's giving me trouble when finding out what V1 and V2 equal.The book says that I1 is traveling through the 8 ohm resistor (R1) towards ground. But when I build the circuit on ...
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1answer
291 views

KCL Node Analysis

I can do mesh analysis with KVL no problem however trying to switch over and to KCL with Node analysis I cannot understand. How do you determine current coming in to the node? I don't understand how ...
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1answer
2k views

Circuit Simulator is being funky

This circuit simulator called "iCircuit" for mac users is showing some weird readings. It's showing a reading of 2.4mA and i'm getting 6mA in my calculations for this circuit I threw up. Am I missing ...
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2answers
626 views

Calculate transfer function with Sine generator

Given this circuit I would like to know how can I find it's transfer function. A method I've considered was to use Node Equations on nodes 1 and 2 , and I have a few things that I don't find clear :...
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1answer
447 views

SuperNode Problem

I'm still having problems with supernodes. Correct me if my logic is wrong. I took the KVL of the circuit which was \$-v_1 +2V_o + V_2 = 0\$; Afterwards, I did the nodal analysis of both the ...
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1answer
579 views

Electromagnetic induction circuit

In the picture below we see 3 LEDs in a parallel circuit. When the switch is closed only LED 2 and LED 3 are on. LED 1 isn't on because it's a diode in the opposite direction. You observe what happens ...
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1answer
198 views

Question about AC-RL circuit

A source power with $$v(t)=5\sin(\omega t)\text{ V}$$ and frequency 1kHz is connected thought an \$RL\$ parallel circuit. The maximum current is 5mA and the resistor current is 4mA. What is the value ...
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4answers
17k views

How to solve R-parallel RC circuit?

How to calculate the Vout when the input voltage Vin is = 20V DC + 10V AC. Here is the circuit:
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1answer
172 views

Help on superposition

I'm trying to figure out \$V_x = V_x' + v_x''\$ For \$V_x'\$, I had open the current source, and tried to solve using KVL. Obviously, \$i_2 = 0.1v_x\$. The equation I concocted was \$-10 + 24I -....
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2answers
2k views

current amplification of a circuit containing a transistor

I'm having trouble with a BJT circuit. What we are given: \$U_{CC} = 10\text{V}\$ \$R_C = 972 \Omega\$ \$R_B = 14\text{k} \Omega\$ \$U_{\text{BE}} = 0.7\text{V}\$ \$I_C = 12\text{mA}\$ We need to ...
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5answers
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Circuit short circuit capacitor question confusion

I am really unsure about how to go about this question and which circuits to consider. Here's the question: Determine the value of the current labeled \$i\$ and the voltage labeled \$v\$ at \$t=0+\$...
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1answer
221 views

Unstable points in a basic memoryless circuit

I have been told that there can be more than a single solution to a circuit, and that some of those solutions might be unstable. As a simple example, a resistor with a constant power source, connected ...
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1answer
543 views

3rd lumped circuit abstraction postulate

So i was reading Anant Agarwal's book Foundation of Circuits and stumble upon this postulate "Operate in the regime in which signal timescales of interest are much larger than the propagation delay ...
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2answers
1k views

Common gate amplifier with load connected to negative DC bias

What's the difference between the following two circuits? Note that the capacitors are DC blocking, and the FET is on. I understand that usually, the load is connected to ground. But what would ...
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1answer
4k views

Circuit Analysis Shortcuts

I am slowly learning how to analyze circuits but I am wondering if my goals are unrealistic. My main reason is to help me repair circuits boards that I come across in my line of work. (I repair coin-...
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1answer
430 views

Confusion about apply nodal analysis

I'm still new to EE, and taking a introduction class right now. I have a simple question regarding nodal analysis. Suppose that we have three things connecting in parallel, One 12 voltage source ...
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1answer
1k views

Calculating gain of amplifiers

I have read an interesting formula that says that \$\mbox{Gain of an amplifier} = \dfrac{\mbox{resistance connected at the output}}{\mbox{total resistance between source and gate of the amplifier}}\$ ...

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