All Questions
Tagged with circuits circuit-analysis
25 questions
0
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1
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62
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Why is the voltage \$V_c\$ equal to the voltage source?
As I said in the title why is \$V_c = V_{\text{in}} = 12\$V?
I tried applying Kirchhoff's voltage law (not sure whether I'm allowed), assuming that the current of the circuit moves clockwise I get :
$...
- 13
1
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4
answers
184
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How to determine in a nonlinear circuit with multiple diodes which diode is ON vs which one is OFF? Does it depend on the orientation of circuit?
This problem is from the Sedra Smith Microelectronic Circuits textbook 7th edition. There are solutions available online but I am having trouble how they determined that in part b, D1 is forward ...
- 33
3
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1
answer
3k
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How to solve combination circuits? [closed]
We were asked to find the total current and voltage, and also the individual currents and voltages of each resistor.
Please teach me the steps for solving each of the circuits, and if you have any ...
0
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1
answer
128
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Why do we use open loop voltage gain in Miller's theorem? Shouldn't we use the closed loop voltage gain?
Let us take the case of the circuit in the image, while splitting the capacitor connected from base to collector into separate input and output capacitors as shown in the second figure. We use Miller'...
- 7
0
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2
answers
278
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How to find a missing resistor?
This seems to be a really simple question. I'm not really sure where I went wrong in my solution. Please forgive me if this seems irritatingly simple, I've only just started learning about electric ...
1
vote
1
answer
291
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How to simplify this complex DC circuit?
I find it very hard to simplify this circuit. Currently practicing for my removal exam and this was one of the problems I failed on one of my previous exams.
Especially the middle part makes me so ...
0
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2
answers
450
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Short circuit behavior in very complex circuits (First Order RL and RC circuit problems)
I do know that a resistor is by passed when parallel to a short circuit or wire with no branches. However what if it was within a complex circuit and not just in the outer loop how does that by-passed ...
3
votes
3
answers
361
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Using complex impedance
Any help getting the answer shown here?
I have tried adding the complex impedance of L and R in series and then adding that to C in parallel. I'm not super sure about that last step, and then ...
1
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4
answers
1k
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Problem with finding output voltage of a diode circuit
I came across this problem while I was working through diode circuits in my textbook, doing problems where we have to graph the output voltage as a function of the input voltage or current. I ...
- 265
3
votes
1
answer
198
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Why is V1 in picture outputting zero? In particular what is the role of R3?
I'm just tinkering around trying to better understand the roles of various resistors in opamp circuits and was surprised by this result.
- 81
5
votes
4
answers
1k
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Averaging thermistor readings
I have 9 thermistors arranged in a grid, and I want to average the readings from these thermistors without code (that is, average them in a circuit rather than reading all the values into a ...
0
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1
answer
276
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Simplyfing a circuit by replacing two nodes with a voltage source and removing a connection between resistors
I am given the first circuit (A) and I have to find the voltage across R4. Since the potential at node C is independent (V2), I was thinking about a possible transformation to circuit B. However, I am ...
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-6
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2
answers
126
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Who will be shocked more? [closed]
Will the elephant be shocked more as it has more cross section area?
Assuming they have the same conductivity.
0
votes
1
answer
782
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Transfer function of two stage op amp?
I have a two stage op amp. I was able to find the TF if it was just one stage, which would be:
$$\frac{V_o}{V_i}=\frac{R_2C_2s}{(R_1C_1s+1)(R_2C_2s+1)}$$
Can I apply the same procedure to the second ...
- 1
0
votes
1
answer
439
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Transfer function of OP Amp circuit system?
I have this circuit here, and I'm fairly certain the function I have is correct but I just wanted to be sure. I am also a little thrown off from the resistor connected to the + of the op amp. The ...
- 1
0
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1
answer
304
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Help with finding the value of current through a resistor in an RL circuit at a specific point in time
This is a homework problem for my circuit analysis class. I can't figure out what the heck I did wrong. I know the solution to the relevant ODE is of the form I(t)=k1+k2*e^(-t/(R/L)), so I just need ...
1
vote
2
answers
720
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Source Transformation and Power Output
In a basic circuit, does making a transformation of voltage source to current source affect the power output of the source? I'm being asked to find the power output of a voltage source and then to ...
-1
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1
answer
2k
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How do we do source transformation in complex circuits to get one source
I have a problem in analysing complex circuits by source transformation like this circuit:
For the previous circuit, if the independent source of the simplified circuit is a voltage source, what is ...
0
votes
1
answer
92
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Advantages of using active inductors in ICs
I have seen that there exist many methods to realize equivalent inductors in IC through active components. For instance, through gyrators realized with Op-Amp.
This solution will require a lot of ...
- 3,590
0
votes
1
answer
85
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Polarity of the voltage drop on inductance
We know from the Lenz's law that the induced voltage on an inductance has the polarity that determines an oppisition to the variation that has generated it.
But in circuit theory the inductance is ...
- 3,590
0
votes
0
answers
41
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Current flow on this branch [duplicate]
What happens in this current branch? In circuit analysis how to deal with branches like this?
1
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1
answer
83
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Trouble analyzing BJT circuits when we change β from very high to 100
For example we have this circuit:
Originally we assumed β to be very high and we assume VBE = 0.7. So for this, we have IB = 0 and therefore V1 = -0.7V and V2 = 3.4V.
Now that we have β at 100, IV1 ...
1
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3
answers
1k
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How to find current in this circuit passing through 4ohm resistor
Below I have added my solution after the question so please let me know how I can solve it after the last step:
These steps to follow to solve the question from where i left in my post ,
FYI :As ...
- 171
0
votes
2
answers
73
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Circuit analysis with node voltage method
The problem requires I determine the value of I0, I think my solution is correct but I don't know how to check because I got the problem from a text with no answers. Looking for more experienced eyes ...
- 21
3
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2
answers
5k
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Find equivalent resistance at terminals a-b and c-d in the given circuit
I tried delta-wye transformation, which hasn't worked for me. Plus, I don't understand how to solve for two different pair of terminals, all problems before this had only one pair of terminals.
- 33