Questions tagged [theory]
Theory is a contemplative and rational type of abstract or generalizing thinking, or the results of such thinking. Depending on the context
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What makes an element resistive / capacitive / inductive / memristive in a strict circuit-theoretical sense?
I am struggling to understand how the terms resistive, capacitive, inductive and memristive are rigorously defined in circuit theory.
In the most general case, every one-port is uniquely characterized ...
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Series or parallel
Consider the simplest possible circuit: a voltage source connected to a resistor. This configuration is usually described as a series connection. However, under some formal definitions of series and ...
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What does LTspice's description of the AC Analysis tool mean?
The text in LTspice's description of the AC analysis tool says the following: "Compute the small signal AC behavior of the circuit linearized about its DC Operating Point".
What does that ...
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Understanding Voltage and Current Phase Difference
I am having trouble understanding the concept of voltage and current having a phase difference in AC circuits. I have recently begun exploring AC circuits and have just started delving into the ...
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VCO theoretical equations - relation between voltage input and frequency output
I'm looking for theoretical equations giving the relation between voltage input and frequency output (of the fundamental mode) using KVL, KCL, hysteresis equations for the second op-amp, ..
The main ...
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Does Faraday’s Law of Induction's conflict with the conservation of energy?
We all know the equation V = -L(△i/△t) where △i/△t is the rate of change in current. If we were able to cut the current ...
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Putting an Ammeter in Parallel with a Wire but Still Having Series-Resistors
I am currently studying EE and am still very early on in my studies. In one of my principles class, my professors showed us the following circuit:
simulate this circuit – Schematic created using ...
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Schmitt trigger confusion
Let's say I have an Op-Amp with positive feed-back, playing the role of a Schmitt trigger.
When analyzing the circuit I set up the following system of equations from KVL:
$$
\left\{
\begin{aligned}
...
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Is there a way to approximate the potential voltage sag?
I am building a load cycler to charge and discharge batteries. The part that is measuring the voltage of the battery is done via the analog pin of the Arduino.
It is able to measure the voltage to ...
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What determines the resistance with which MOSFETs fail short?
In the case of electrical or thermal overload, MOSFETs usually fail short with a relatively low resistance in the range of ohms or tens of ohms. This answer on "Do MOSFETs usually burn open or ...
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Input impedance of an op amp when sharing bias resistor across multiple op amps
This is a theoretical question more than it is a practical one, and perhaps a bit simple, but I cannot find a reliable answer. Let's say you have a simple op amp buffer like the one below:
Source: ...
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Karnaugh Maps and "Impossible" Bit Combinations
I'm new to learning about how to use Karnaugh maps to optimise truth tables into efficient logic circuits, and have been following Dave Jones' excellent tutorial.
As an example to work on, I have ...
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Complex Power Conservation or "Boucherot's Theorem" - a proof without Nodal Analysis
Brief Question
I'm trying to figure out a proof for the Complex Power Conservation Theorem, which does not use Nodal Analysis.
Theory I know
In my university this theorem has ben taught with the name &...
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Capacitive proximity sensor - Working principle
I'm looking at the working principle for capacitive proximity sensors, when I read online I seem to get conflicting info.
I know that an oscillator is used to generate an AC current, and this is fed ...
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Capacitor problem
I am studying for my circuit theory exam and I came across a problem which is shown in the picture. What will be the voltage here?
I simulated a similar situation by connecting the negative terminal ...
