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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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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 ...
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 $\Omega$ ...
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 ...
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?
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 ...
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 ...
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 ...
63 views

### Finding current in RLC circuit

I am given the following circuit: Thanks for any help.
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. ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 (...
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 ...
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!
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?
87 views

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 – ...
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 ...
66 views

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 ...
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 ...
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?
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 ...
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?
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∠*...
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, ...
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 ...
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 ...
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 ...
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 ...
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/...
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 ...
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, ...
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
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 , ...
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 ...
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 ...
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 ...
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 \...
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 ...
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 ...
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 \, \, \,\,...
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 ...
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 ...
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 ...