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Questions tagged [homework]

Use this tag if the question you are asking is an assignment or homework with which you require assistance. EE.SE is not a homework answering service, so make sure you show what you have attempted so far and are specific as to where you have gotten stuck.

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2
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1answer
59 views

Root Locus in a feedback loop

I'm trying to draw Root Locus by hand from the following block diagram and confirm the result I got from Routh Hurwitz's table: The table of Routh Hurwitz that I got is the following: And from the ...
0
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2answers
94 views

Why is voltage drop independent of this 4 Ohm resistor?

I have this resistor which is connected to some battery (not very important). I don't understand why the total voltage is equal to the voltage drop over the 3 \$ \Omega \$ and 2 \$ \Omega \$ ...
1
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0answers
26 views

Build output voltage graph as a result of the integration on an ideal integrator

Picture related is an original task(in Ukrainian): Translation of the task 1(till «Задача 2»): Build the graphic result of the integration on an ideal integrator if R=40 kOmh, C=20 uF and the input ...
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1answer
68 views

Laplace transform in a block system

I'm trying to understand the resolution of the problem 5.11, but I can't understand how she gets the expression in the rectangle: $$\dot{x}_1=-x_1+2u$$ How can I get the expression in the rectangle?
0
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0answers
20 views

Find the load capacitance of a phase in a three phase circuit

I'm new in electronics circuits, and I came across a problem that asks to find the load capacitance of a phase such that \$cos(\phi)=1\$ on a three phase circuit where the load on the Y source is ...
1
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0answers
96 views

With what force can a solenoid pull?

I am conducting an experiment, and a hugely important part of the experiment is a solenoid and an iron rod. If the solenoid has current going through it, and I place the iron rod so that it is not ...
0
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0answers
24 views

Short N region diode

A diode was manufactured by making an abrupt junction between a region of length \$W_p\$ having a concentration \$Na = 10 ^ {18} cm^{-3}\$ and a region \$ W_n\$ with \$Nd = 5.10 ^ {15} cm^{-3}\$ of ...
1
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1answer
63 views

Finding current in RLC circuit

I am given the following circuit: Thanks for any help.
2
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1answer
89 views

How to wire up a street light to change lights in specific states (digital circuit)

This is the final project for the only electronics course in my career. I have never taken any other electronics course and I'm seriously at a lost here. I need to score 100 here to pass the course. ...
0
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0answers
37 views

Building a Rudimentary Homopolar Motor with an External Battery

I need to make a rudimentary homopolar motor with an external battery, so that the voltage of the motor can be easily adjusted. I'm having trouble making a system where the external loop can spin ...
1
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2answers
97 views

\$V_o/V_s\$ of given circuit

I'm trying to calculate $$\frac{V_o}{V_s}$$ of the given circuit, but don't really know what to do with the voltage dependent voltage source. As I'm not an engineering student, this stuff is very ...
0
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1answer
33 views

Homework: AC circuit analysis correctness equations using nodal analysis

I've been struggling to find the equations needed to find \$V_o\$ and \$I_o\$ for the circuit given below. I came up with the following equations using nodal analysis and wanted to ask whether they ...
1
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2answers
81 views

Choosing between 16-bit and 24 bit ADC [closed]

In my application the 16-bit ADC would have enough resolution, but is there any pros choosing 24 bit ADC over a 16 bit ADC, if they otherwise have the same specs? Both of these would be suitable for ...
0
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0answers
24 views

Modeling small signal equivalent circuit of a transistor circuit

For this homework question, I have to model the circuit and find output impedance. The question states that the capacitors can be modeled as short circuits. As I think I understood it, the resistor ...
0
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1answer
50 views

How to find equivalent resistence of this mixed circuit?

Find equivalent resistance, the current in R5, Voltage of R2 and power of R10. Actually, I don't know if my attempt is right. So, you would point out where there are mistakes, pleased. R10 and R11 ...
0
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3answers
49 views

Circuit mesh analysis with 2 voltage sources

I'm pretty stuck trying to solve the below circuit. I need to find the node voltages and branch currents. I've tried it using mesh, nodal and superposition analyses, but I just can't get the right ...
0
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0answers
31 views

Design 2 Op-Amp Circuit with Desired Output

I need to design an op-amp circuit with two inputs v1(t) and v2(t). I have the constraints: - Input impedance for v1 and v2 is the same w kOhms. - Output v3(t) = - x *v2(t) - y *v1(t) - (w us)dv1/dt (...
0
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1answer
52 views

Breadboard circuit with PN2222 transistor, LED constantly on

I am trying to build a breadboard circuit for my class assignment using a PN2222 transistor. The LED light is constantly on, without pressing the switch (button). The directions of my assignment ...
1
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2answers
93 views

What of value of R result in V=0

As shown the answer is 15 Ohm's . I don't get the trick of the question. can anyone explain to me how we can get the value of R Thank you all!
0
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1answer
68 views

series connected capacitor

simulate this circuit – Schematic created using CircuitLab How does the capacitor behave here? I tried and the led flashed. Does the capacitor work like a diode after charging?
0
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0answers
87 views

Can someone please help me find the equivalent resistor of this circuit?

Well I have to find the equivalent resistor of these ones and I am having a hard time trying to find it so some help will be appreciated. Figure 1. Original schematic. simulate this circuit – ...
9
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4answers
4k views

Why exactly does maximum power transfer happen at 50 ohms (matched impedance)?

As the title mentioned - I am not sure why exactly the maximum power delivered to the load will be max when R_L is 50 ohms. If I guess why, it's because if the resistance was greater than 50 ohm then ...
0
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0answers
66 views

Please help with part of this textbook question

Please help me solve this problem for the superimposed case when only the far-right current source is used. What I have tried is assuming there are 3 voltage divisions {on the far left, v is 1/2 of ...
0
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2answers
45 views

Time-Invariant System

I don't know if I'm missing a step or a (mathematical) concept is unclear but when I apply time-invariance property: 1) delay original output y(t) by t0, check resulting expression y(t - t0) 2) delay ...
0
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1answer
57 views

Energy of a complex exponential signal

Noob question here. Why would the term \$j2\pi t\$ not have any effect on the energy of the signal?
0
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1answer
61 views

Help me see if I understand this RLC circuit

The switch closes at t=0 I need to determine the current and the voltage of Capacitor at t=0.25s at t<0 the switch is open there is no current and no voltage at t=0 the switch closes the current ...
1
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1answer
83 views

NMOS with gate source shorted and negative threshold voltage

First of all is it really possible to have a nmos with negative threshold voltage? If threshold voltage for M1 was positive, then M1 would be in cutoff. How do I analyze this circuit?
-1
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1answer
69 views

Capacitors capacity in an RLC circuit that is in resonance [closed]

So if its in resonance that means XL=XC right? anyway thats how I started I∠=Irms∠=7.07/sqrt2 ∠30° A ω=10^3 Z1=R+jXL=1+1∠90°=sqrt2∠45° Z2=-jXC=1∠-90° Ztotal=(1/Z1+1/Z2)^-1=sqrt2∠-45° U∠=I∠*...
0
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1answer
50 views

Help finding voltage between two points

So, how should I proceed to find U_ab (or V_ab)? I have found I = -0.5mA, U_1=-2.5V, U_2 = -0.5V, U_3 = 2.0V. How would I even find U_a and U_b separately so I can apply U_ab = U_a - U_b? Also, ...
1
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0answers
33 views

Calculations for 3-phase circuit in multisim

I have homework exercise which is looks like, and I'm trying recreate situation in multisim. Is my approach is good - are values of elements are proper? After calculations I will end with some exact ...
0
votes
1answer
186 views

Is my circuit solution correct?

simulate this circuit – Schematic created using CircuitLab I have to calculate the energy of the inductors magnetic field at t = 6 ms. I am given: E = 50 V, R1 = 10 Ω, R2 = 15 Ω, R3 = 20 Ω and ...
0
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0answers
47 views

JFET: Find ID (Drain) and VD

Hello everyone as the title says I need to find: Id (Drain) and Vd of the circuit. If use the below type for above circuit i will take correct result? Id = Idss(1 - Vgs/ Vp)^2 Vd = Vcc - Id* R45 ...
0
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2answers
57 views

I have to find all the voltages and current in the circuit

I am given Uab=100V XL=6Ω XC=3Ω R=4Ω This is how I started X=XL+XC=9Ω Ztotal=sqrt(R^2+X^2)=9.84Ω Zab=R+jXL=4+j6=7.21∠56.30 I=Uab/Zab=100/7.21=13.86A but obviously I made a mistake somewhere ...
1
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3answers
70 views

Electrical RL circuit problem

So I am given u(t)=325sin(314t+90°)V i(t)=14.14sin(314t+30°)A I have to find the impedance Z∠θ, value for the resistor and inductor, inductive reactance Urms∠θ = 325/sqrt2 ∠90° Irms∠θ = 14.14/...
1
vote
1answer
114 views

Op-amp circuit hysteresis calculation

Given this circuit, I have to find \$\frac{V_2}{V_1}\$ as well as the magnitude of hysteresis. I don't need a full solution. Any hints to approach this problem would suffice. So far, I know the left ...
0
votes
0answers
66 views

Time period of output in relaxation oscillator circuit

I'm an electrical engineering student, and have spent the last 4 hours trying to figure out the time period of the output of the circuit below (in terms of the variables shown in the image). So far, ...
-1
votes
2answers
81 views

how to write a 8085 assembly language to sort 5 data bytes in ascending order [closed]

Needed advise on how to program using 8085 simulator. tried many ways but could not get the answer
0
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0answers
14 views

Linearly graded and step graded PN Junction represent uniform or non-uniform doping?

Linearly graded and step graded PN Junction represent: a) Non-Uniform Doping , Uniform Doping b) Uniform Doping , Non-Uniform Doping c) Uniform Doping , Uniform Doping d) Non-Uniform Doping , ...
1
vote
1answer
70 views

How do I measure the voltage across R3 (Va) in this circuit?

This circuit has been troubling me for a few hours, I've been able to measure Vout and the Thevenin Resistance, however, I haven't been able to calculate the voltage (Va). Any help would be ...
3
votes
1answer
204 views

Finding the current in a parallel circuit

How could we find the current that passes through each resistor in this circuit? The problem is that we don't have the voltage of each resistor to find the current, because the voltages of the ...
0
votes
1answer
84 views

Diode circuit analysis solution

I am not familiar with circuit analysis, although I can manage to solve basic circuit. However, I am currently stuck with a problem and I am not sure about the solutions. If anyone could have a look ...
1
vote
2answers
74 views

When is a Gate potential zero?

I have this fairly simple NMOS and it is mentioned that I can determine the Source current \$I_3\$ with the formula \$ I_3 = \frac{K}{2}(V_{GS} - V_{th})^2 \$. Here they equalize Gate Source Voltage \...
0
votes
0answers
40 views

Transfer function with separate time delays in each term

We've been given the problem below for our current assignment As far as I can recall, I have never seen a transfer function with time units in the function itself, added onto each separate term. I ...
1
vote
1answer
125 views

Direction of current flow in resistor networks

We have a simple resistor network \$g\$ with \$5\$ nodes and \$6\$ edges (resistors) as given below: We assume all resistors have the same resistance (say \$1\$ Ohm, so homogeneously distributed ...
0
votes
2answers
203 views

8051 microcontroller problem to find execution time of part1 for a given code

For the below mentioned 8051 assembly code: Time elapse: MOV R0,#100 Part 1 \$ \quad \, \, \,\,\$ : MOV R1,#50 Part 2 \$ \quad \, \, \,\,\$ : MOV R2,#248 Part 3 \$ \quad \, \, \,\,...
0
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0answers
142 views

Building a 6-inputs XOR gate with only 12 AND/OR gates

I would like to compute a 6-input XOR gate with only 12 AND/OR gates, any number of inverters can be used. I failed to find any optimization with the K-map and so far I can only decompose it with 13 ...
0
votes
1answer
139 views

Common Emitter Stage BJT Amplifier with Early Effect Inclusion

How can I find Rin, Rout and Gm parameters of a BJT amplifier in common emitter stage without neglecting Early Effect? We have such homework and I couldn't find the exact same example in Behzad ...
0
votes
2answers
74 views

Output of AC op amp circuit has unknown superimposed signal on top of expected output signal

I am trying to find the voltage gain of a certain ideal op amp circuit with a sinusoidal input. However, when I simulate the circuit, the output shown seems to be my calculated output but with a ...
2
votes
1answer
61 views

Resistor combining problem

How can I get I1? I tried combining the two 10 ohms resistors on the right and up in parallel but I always end up getting 2A which is a wrong answer.
0
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1answer
39 views

Voltage controlled current source question

Need to find ratio Vs/Vo in terms of the 3 resistors and gm. I have expressed Vo/Vs as gmvgsR2/Vs but am unsure how to express Vgs in terms of the R1, R2 R3 and gm.