Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.

A network, in the context of electronics, is a collection of interconnected components. Network analysis is the process of finding the voltages across, and the currents through, every component in the network. There are many different techniques for calculating these values. These techniques generally assume that the components of the network are all linear.

Consider using in conjunction with tags for the particular analysis technique(s) in question: , , , etc.

See Wikipedia's article on network analysis for more information.

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Under what conditions is the star-mesh transform invertible?

We all know and love the Δ-Y (delta-wye) and Y-Δ (wye-delta) transforms for simplifying three-resistor networks: Image from Creative Commons The Δ-Y and Y-Δ transforms have the nice property that a Δ can always be turned into a Y, and a Y can…
Li-aung Yip
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Internal resistance of a battery

I am trying to figure out where I went wrong on the following problem: simulate this circuit – Schematic created using CircuitLab The two batteries are identical, and each has an open-circuit voltage of 1.5V. The lamp has a resistance of…
r.j.
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How do I use superposition to solve a circuit?

Yes, this is a pedagogical question. While answering another recent question, I wanted to refer the OP to concise instructions for using superposition to solve circuits. I found that all the easily found resources online were somewhat deficient.…
The Photon
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How do I do basic circuit analysis with resistors rated in watts instead of ohms?

In my electrical circuits class, we've spent the last six weeks learning circuit analysis with resistors rated in ohms. Now, out of the blue, every question on the next practice exam has the resistors rated in the watts they consume. Here is a…
BStott
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Why does the current not skip resistors R3 and R5 when R6 and R4 have no resistance?

I do not understand why the current still flows through resistors R3 and R5 when R6 and R4's resistance is 0. To me, it would seem that the current would skip R3 and R5, however the answer key says otherwise. I have attached the problem and answer…
David Jones
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Relationship between time constant and frequency

I have seen the relationship that the RC time constant (\$\tau\$) is equal to the inverse of the -3dB angular frequency (\$\omega\$). The time constant is in units of seconds, while the angular frequency is in units of radians per second. My…
bears34
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An intuitive interpretation of Negative voltage

This seems to be very basic but I am confused about it. I know ground is a point whose potential is zero. Now let's take a piece of wire , and mark a point A on that wire. I said , A has potential of -15 with respect to ground, what does that…
Sayan
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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-op equipment) Sometimes the most info I can…
user7684
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What is a fractional-order circuit?

Despite some basic knowledge in electronics, and maybe because of my non-english tongue, I don't understand the term "fractional-order circuit", that I've read on a paper. Could a specialist explains the meaning of this term, as well as the…
JCLL
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Does a diode block current but not voltage?

When running this test circuit on CircuitLab and my expected result was that only M1 would open but then i noticed that the M4 mosfet is also open even though there is a diode between it and the the 3V the Gate threshold on both is set to 1.5v i…
soundslikefiziks
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Why can't mesh analysis be used for non-planar circuits?

My book simply states this without any kind of explanation.
dfg
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In this circuit, please explain why the voltage of Zener diode drops

In this circuit, can you explain why lowering the resistance in right most branch (10 Ω in the first picture) reduce the voltage received by the Zener diode. I understand that voltage splits proportionally to the resistances in series but it seems…
silkAdmin
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Why is there current if there isn't any potential difference?

As far as I understand, you need potential difference to draw current. Assuming ideal conditions, we can state that there is no resistance in the path, and therefore the potential difference between the resistor R1 is V1. This potential difference…
merovingian
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Do you really need a capacitor from pin 5 to ground in an astable 555 timer circuit?

Do you really need a capacitor from pin 5 to ground? Some circuits show it, others do not. Timer calculators don't use it when calculating freq and duration of pulses.
user242509
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Simplification down to a single resistor

How would you go about simplifying this circuit down to a single resistor? It’s Learning assesment E2.23 in "Basic engineering circuit analysis (Ed. 10 & 11)" I have found out, that the current dosent just go down the path without the resistor,…
Bertram
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