All Questions
Tagged with circuits electrical-engineering
72 questions
0
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1
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254
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Find average electron velocity on copper bus bar(um/s)
I was given this problem:
A current of 1,400 Amps flows in a copper bus bar. The bus bar is 0.6 cm wide by 9 cm long. You can assume the current flows only on the surface of the bus bar (so you can ...
- 3
0
votes
1
answer
119
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Help with two-port network parameters problem! [closed]
Help me, please. I im studying circuit analysis and i couldn't solve this problem.
- 11
0
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1
answer
122
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Measuring Current In/Out of Resistors [closed]
The banana clips attach to a multi-meter out of view, the power supply wires are correctly in place, and the resistors are correctly in place. Would putting the red left-hand banana clip and its ...
2
votes
1
answer
417
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Designing a Voltage Divider [closed]
I am struggling to solve this problem and my available time conflicts with my professors available time. Could any of you offer me some help, perhaps describe the method I would use to solve such a ...
- 21
2
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0
answers
50
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Comparisons of multiplier circuits
Could someone please explain some of the advantages/disadvantages of the wallace multiplier circuit vs a shifting and adding multiplier circuit vs an shift register multiplying circuit? We went over ...
- 131
1
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0
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279
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Calculating gain of an overall system. Analogue electronics
Our professor has given us a review for a upcoming exam. But he has never done anything like this question and it has stumped a quite few of us. We are hoping someone can walk us through this so we ...
- 321
0
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1
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47
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Is the current on the terminals of an opened circuit is zero?
Say we got this circuit:
Initially we had the X resistance, but then I opened the circuit in the terminals of resistance X, and I moved the resistance X to the equivalent circuit (my teacher says ...
- 121
1
vote
2
answers
367
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Ideal op amp circuit with variable voltage gain, how do I calculate the current?
I am currently calculating various quantities for the circuit shown below. However, I am stuck on how to calculate the current (Ix) and the input resistance (0 output current). The circuit is an ideal ...
- 11
1
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1
answer
821
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Multi Ratio Current Transformers
I encountered a problem in measuring electrical energy using a multi ratio current transformer (CT). The catalogue of CTs is unavailable.
I have little information about the type of CT I am using. I ...
- 115
1
vote
1
answer
376
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How the electronic circuit control laser diode? [closed]
I find this scheme here
1 - is data stream come from computer. This 'data' is an electric signal moudulated by the n°2
2 - this is the electronic circuit inside printer that
a) activates the corona ...
- 65
1
vote
2
answers
3k
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No Voltage appearing on Pspice
I am trying to compelte this question, however when i run the simulation there is no voltage atall on the output votlage, and cahnging the capacitor value as requested in the question does not chane ...
- 143
1
vote
2
answers
86
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Help with reading resistor color codes
I'm having a difficult time identifying a resistor's value as I can't find the golden / silver tolerance line.
The problem is that I can't see a silver or gold line here! They're both brown on both ...
- 111
1
vote
0
answers
140
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What are the various lumped element dynamic system models called?
What are the various lumped element dynamic system models called? By lumped element dynamic system models, I mean the various nodal models comprised of things that look like capacitors, inductors, ...
- 121
4
votes
2
answers
187
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Circuit Design Inductor Problem
I am having trouble finding a 3.4 µH through hole inductor that is in stock right now. I was wondering if I can just place 2 inductors that add up to 3.4 µH in series to solve this problem. I am not ...
- 43
-5
votes
1
answer
130
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In the equation for power as a function of current and resistance, what do the two factors for current represent?
In the electric power equation $P=RI^2$, $P$ represents the product of $RII$.
I'm trying to understand the fundamental anatomy of the $RII$ term. More precisely, why does the current, $I$ appear ...
- 101
-2
votes
1
answer
1k
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Transformers with no load [closed]
Could someone please explain why, when there is no secondary load, the applied voltage of the primary roughly equals the back EMF of the primary? Since the primary coil is an inductor I wondered ...
- 101
3
votes
3
answers
3k
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How do you find "this" Vx in the given circuit?
So I was told that $V_x$ is equal to 10V.
I tried reasoning out why $V_x$ was 10V and this is what I got:
-You can treat the Vx as an open circuit which means current does not flow through the ...
- 31
0
votes
3
answers
323
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Is battery-charge-stop-at-XX-percent circuitry not cheap? [closed]
I'm curious why IBM/Lenovo ThinkPad line is basically the only manufacturer/brand of mobility devices that includes circuitry and software that allows one to vastly prolong battery life of laptops ...
- 155
3
votes
1
answer
297
views
What does this Logic Circuit do?
So I have to analyze this circuit, with inputs C0, A0, B0, A1, B1, A2 and B2, and outputs S0, S1, S2 and C3. It's been suggested I don't use a truth table to figure it out. I need to find out what the ...
- 31
0
votes
4
answers
4k
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Is there current multiplier circuit?
Is there an electric circuit that can multiply the input current? if yes, what is that called, and how to make it?
My input is DC from a small DC motor which I use as a generator.
My input current is ...
user2338
8
votes
2
answers
828
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What does a Sad Face on a circuit board mean?
I have a Fisher and Paykel Washing Machine (model number WL80T65C, well past warranty) which got rained on (a lot) and one of the capacitors blew up. I've done an amateur replacement of the capacitor ...
- 191
2
votes
2
answers
1k
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What is the purpose of the capacitors on LDO Regulator Circuit?
What is the purpose and benefit of the two capacitors on both the input and output pins of a LDO Regulator?
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