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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Kirchhoff's law question

Can someone please help me to solve this problem? I tried to solve it:
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-2 votes
2 answers
77 views

How to design an analog circuit that turns on a dripping irrigation systems? [closed]

...
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-1 votes
1 answer
46 views

Resonant frequency of RLC circuit if for two values of omega we have same max amplitude current

Original question: An alternating current is flowing through a series LCR circuit. It is found that the current reaches a value of 1 mA at both 200 Hz and 800 Hz frequency. What is the Resonance ...
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1 vote
1 answer
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Control system transfer function

I tried to find the transfer function F(s) = C(s)/R(s) through block manipulation and through Mason's Formula but the results are not matching. Where is the mistake?
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-3 votes
2 answers
54 views

Computing voltages over resistors [closed]

How do you use the combine/redraw method to find the voltages of the different resistors?
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-1 votes
1 answer
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Solenoid magnetic induction graph

I need help solving this problem, if anyone had a similar problem it would help me a lot. A table is given with the current flowing through the solenoid,also values ​​for the magnetic induction vector ...
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1 vote
1 answer
58 views

Loaded transformer. Unclear origin of formula

From a homework task. Given: nominal input $$U_{1N}$$ and nominal current output $$I_{2N}$$ Also given: output voltage without load $$U_{20}$$ and short circuit voltage $$U_{KN}$$ As for nominal ...
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-2 votes
1 answer
121 views

How to find nature of RLC circuit?

If a resistance value, XL value and XC value are given, how do we determine the nature of the circuit (whether it's capacitive, resistive or inductive)? The only thing that comes to my mind looking at ...
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3 votes
1 answer
147 views

Analysis of a comparator circuit

I am struggling to analyze this (admittedly homework) Op-Amp circuit. Voltage divider approach Now if we treat the input into the negative terminal as a voltage divider we get $$ V_- = 10V* \frac{5}{...
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1 vote
1 answer
90 views

Solving the open circuit voltage and voltages not summing up to zero

I tried solving this circuit using mesh analysis. I actually do not understand on how I can find the voltage in the open part. Moreover, the voltages of resistors in some loops are not summing up to ...
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1 answer
393 views

How to find current through the 5 Ω resistor using Thevenin's theorem?

I tried to take the 5 Ω resistor as Rl but still couldn't find the answers as given in the green highlight. I'm pretty new at this and can only manage solving straightforward circuits. I managed to ...
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1 vote
1 answer
64 views

Nyquist's theorem misunderstanding

I have been assigned the following question: From what I understood of Nyquist's theorem for a signal that contains power over a range of frequencies that does not include 0 Hz i.e. over a known ...
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2 votes
2 answers
264 views

AC circuit analysis homework, finding voltages and currents

I've been trying this question for a while. I'm not sure where to start. I tried redrawing the circuit differently but that did not help much. Please ignore the fact that my drawing is not neat, it ...
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4 votes
2 answers
588 views

Circuit analysis homework - LTspice results are different from calculations

Original question: I have already tried calculating it, but after simulating the circuit in LTspice, the answer is different. My working is shown below. I've included a screenshot of the LTspice ...
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1 answer
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How to understand the next values of a comparator inverting with hysteresis (Schmitt Trigger)?

I have my test graded and I'm curious about a question, since I think it's badly graded and I may need to request a revision. I have been told there is a comparator inverter with hysteresis so \$|V_{...
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1 vote
1 answer
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A coil of inductance 0.50 H and resistance 100Ω is connected to a 240 V, 50 Hz ac supply. What exactly is 240V here?

As far as I've understood, doesn't 240V represent Vm here? We solved questions in class like these (but in those it was inductance only) and there we took Vm one as the one given with the frequency. ...
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-3 votes
1 answer
59 views

Find the range of uncertainty? [duplicate]

The problem says that an ammeter has a 30 mA upper measurement limit and its accuracy class is 2%. For the relative measurement error when measuring 22 mA, I found it is2,7%. I used the formula h(%) = ...
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0 answers
30 views

Electric fields inside the parallel plate capactitor where 2 dielectrics are inserted

This post is of check-my-work one. I need your check. The green-painted parts are which I want to derive the equations. 2 parallel-plate capacitor with 2 dielectrics which are inserted between the ...
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-1 votes
2 answers
140 views

Second Order Passive Low Pass Filter RC Circuit Design [closed]

I'm learning about Second Order Passive low Pass Filter RC Circuit for my homework. I need to create a circuit with a specification that has a 1 kHz cut off frequency. I quickly learned on how to ...
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1 vote
2 answers
185 views

How to derive the transfer function of this op-amp?

For the 1st question, is this a Sallen-Key filter? What criteria must a circuit possess in order for it to classified as a Sallen-Key filter? I searched the internet but found no clear answer. For ...
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1 vote
2 answers
85 views

Common Mode Noise Attenuation

The question is below: Your raw sensor signal is 6.5 mV, and you are using an instrumentation amplifier to process it. The amplifier has a CMRR of 80 dB and a differential mode gain of 40 dB. If the ...
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0 votes
0 answers
47 views

Designing a controller (control systems)

I have to propose a controller C such that the entire closed loop system would be stable and the error approaches zero as time goes to infinite. I'll now explain in more detail. I need to find a ...
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1 vote
1 answer
96 views

How to solve a parallel RLC circuit when the resistor and the inductor are in series

I have a parallel RLC circuit where the inductor is in series with the resistor. The value for the frequency is 200hz and the value for the current of the circuit is 5mA. The experimental answer is 1....
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1 vote
2 answers
131 views

Solution Verification: Thevenin Equivalent with Dependent Voltage Source

I am currently self-studying through MITs 6.002 Spring 2007 course. There are currently no solutions for the assignments afaik. Normally, this isn't an issue, but I am having some trouble with this ...
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0 answers
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How does solar PV modules array Power, Voltage in Series/Parallel affect maximum power efficiency

I have been struggling with my homework on my course (Solar PV Panels) today. Edit : PV Module parameters are below. These are for STC. In our case, it's 650 W/m^2 and 55°C. I have calculated IL and ...
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-3 votes
1 answer
84 views

How to make a 555/556-based one-shot timer on a breadboard? [closed]

How can I implement the circuit as described below on a breadboard? The Monostable or “One Shot” Refer to the datasheet for the NE555 https://www.ti.com/lit/ds/symlink/ne555.pdf Find and read the ...
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2 votes
2 answers
222 views

Using mesh current method find current and power in 15 Ω and 3 Ω resistor branches of the circuit

I assumed i1 in the left-most mesh, i2 in the right-most mesh and i3 in the top mesh, all clockwise. i2=-2 A from the circuit The equations I got were: from left mesh: 11 - 14 i1 + 12 i2 + 2 i3 = 0 ...
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-3 votes
2 answers
134 views

Preamp stage for audio amplifier using LM741CN clipping too early [duplicate]

I'm trying to build the preamp stage for an audio amplifier circuit using the LM741CN. I'm using a variable resistor for Rf so that I can vary the gain. What I'm finding is that when I have Rf set to ...
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-1 votes
2 answers
106 views

Where do I apply KVL in this given circuit? [closed]

I would like to solve for the unknown voltage and current \$V_x\$ and \$I_x\$. Below is the image of the circuit. Should I first solve the current flowing in resistors 3 and 4 through equations of KVL ...
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2 answers
70 views

Getting current and voltage on a resistor using simplification

I hope it's okay if I ask it here, but I've been playing with this current for quite some time now, and I've reached a dead end. I am supposed to find the amperage and voltage of a specific resistor (<...
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1 answer
50 views

Calculating values from circuit diagram about a Zener diode

Given D1 is a 10 V Zener diode, R1 = 1000 Ω and the following circuit diagram Find the current \$I_D\$ through the diode (D1). \$I_D = \frac{11 - 10}{1000} = 1\$ mA, is the maximum current through ...
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0 votes
1 answer
88 views

How to Choose Design Specs for Passive and Active filters [closed]

I have a work to do about the active filters, but the requirements looks to me repetitive and redundant, but beyond what it seems to me, it has to be done. Perhaps is a bit boring, because I would ...
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1 vote
2 answers
75 views

Find current and voltage through the circuit

Solve using KVL and KCL and find voltages and currents. For this I took $$i_1=i_2+i_3$$ $$v_1=2i_1$$ $$v_2=8i_2$$ $$v_3=4i_3$$ The equations I got by assuming loop 1 and loop 2 were $$5i_2 + i_3 = 5$$...
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1 vote
0 answers
48 views

Direction of magnetic flux of mutual inductance where coupling coefficient is almost 1

I've drawn the below diagram of the circuit. We will handle the system as the switch is closed . The coupling coefficient of the system is almost 1 I assumed \$~ L_{1} ,L_{2},M ~\$ are all positive ...
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0 votes
1 answer
88 views

Total force made by the magnetic fields and the current, it should be zero but as I tried to derive it , the upward components only remains

As shown in the above diagram , the same 2 coils of square are aligined with paralell of same plane . $$ I:=\text{current which flows to each wire of the square } $$ What I am confusing to ...
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0 votes
1 answer
160 views

Please help in the steps of finding Rth and Vth in the following circuit

The answer is Vth=0.839 V and Rth=3.77 ohm but I can't get the right answer. Please give me the steps to find it. what i did to find Rth: removed RL and 6V, 6 & 8 ohm are in parallel, which gives ...
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0 votes
1 answer
76 views

Finding out the magnetic field inside the cross section of the torus which is wrapped by conductive wire and the current flows it

As shown in the diagram , the torus of radius of \$~ R ~\$ exists . The wire is wrapped around the torus . $$ N:=\text{total number of the turns of the wire around the torus } $$ The current is ...
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0 votes
1 answer
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\$\delta n \cdot x + n \cdot \delta x~\$ equation of shrunk coil with incremented number of turns per unit length

The very long coil exists with the following information . $$ a:=\text{radius of the circle of the coil} $$ $$ n:=\text{number of turns of the coil per unit length} $$ $$ x:=\text{lenght of the ...
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0 votes
4 answers
581 views

Constructing a sine/cosine waveform circuit using combinational logic

Design a combinational circuit based sine and cosine waveform generator having 4-bit signed output. Each waveform should have equally distributed 16 data points. Digital circuit must be realized in ...
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0 votes
1 answer
124 views

Toggle light bulb using relay or traditional switch button in parallel

I'm working on my school project. I want to control a light bulb using SSR relay (and nodemcu), but I also want to give user the option to toggle the light bulb using the traditional switch button ...
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1 answer
233 views

Transformer heating

I have difficulty grasping the concept of transformer heating and the overall effect on voltage, current and magnetic induction. I assume that for a transformer to heat up the current should increase ...
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1 vote
2 answers
109 views

Using current division to find voltage

I'm a beginner in electrical engineering. I am having trouble with this circuit analysis problem. It asks to simplify the circuit into an expression for \$V_L\$ in terms of \$R, R_L,\$ and \$i_S\$. ...
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-1 votes
1 answer
121 views

How to calculate voltage between AC phases with different angles? [closed]

I am trying to understand some fundamentals about AC three phase wave forms, in this case is related to how to get the voltages between phases in real environment that as we know they have different ...
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0 votes
1 answer
86 views

\$\Vert\boldsymbol{E}_{}\Vert=\Vert\boldsymbol{v}_{}\Vert\cdot\Vert\boldsymbol{B}_{}\Vert\cdot\sin^{}\left(\theta\right)~\$is seemingly not applied

I want your help to find whether the misprint exists or not . $$ H :=\text{magnitude of the uniform magnetic field which comes from leftside} $$ $$ a:=\text{radius of the cylinder-formed ...
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0 votes
0 answers
55 views

Estimate the charge supplied by the input pulse in the following circuits. What is each circuits' input capacitance?

Source: CMOS Circuit Design, Layout, and Simulation, Fourth Edition by R. Jacob Baker. 201 I am having trouble solving for this one. I think I did the difference in voltage between gate and drain and ...
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9 votes
0 answers
184 views

Speed of compound wound dc motor

This is homework. Given a 500W, 200V compound wound motor with constant shunt field and a series field that varies with armature current, how do we calculate the change in motor speed. I know the ...
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0 answers
62 views

Is the power consumption of field effect transistors lower than that of bipolar transistors, and why? [duplicate]

Is the power consumption of field effect transistors lower than that of bipolar transistors, and why?
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0 votes
1 answer
58 views

Impedance to supply voltage

Looking at this question in a design exercise. I'm trying to work out where the impedance to the 9V power supply comes from. It's given the typical complex impedance of a PCB track at 1kHz is 0.1 + j0....
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0 votes
1 answer
75 views

Current calculation dependant on Mbed PWM voltage

I'm looking at this question in a design exercise. By simple calculation the voltage is 9V, the impedance of the heater is 3ohms. So the current through R is 3A? OR Do I need to take into account the ...
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0 votes
0 answers
29 views

How can I relate input voltage, load voltage and reflection factor r?

I am given a circuit as given below. I have to find the relation between \$U_2\$ , \$U_1\$ and \$r_a\$ (reflection factor). I couldn't find the expression containing only these three terms as given ...
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