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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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How to find the power factor of a component when the combined power factor and one other power factor is known? [closed]

Problem: A 2000 volt-ampere with a power factor of 0.8 lagging is combined with 500 volt-amperes of synchronous motors. If the overall power factor is 0.9 lagging, find the power factor of the ...
tryingtobeastoic's user avatar
0 votes
1 answer
41 views

How to calculate transformer iron core losses?

For a 3 phase, 60 Hz, 6600/690 V, star/delta transformer Rating is 2500 kVA At full load unity power factor it has an efficiency of 97%. Maximum efficiency occurs at 2/3 of the full load How to ...
Branathon2's user avatar
2 votes
1 answer
74 views

Electromagnetics - Calculating electric field vector given an equipotential surface

I'm trying to figure out how to calculate the electric field vector given an equipotential surface with the equation \$ x^3 + y^2 +z = 1000 \$ where x, y, z are positive. The potential on the surface ...
Amit M's user avatar
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0 votes
0 answers
54 views

differential gain for mismatched \$g_m\$ in differential amplifiers

I couldn't understand how the author came up with the expression of differential mode gain. He states to look from the Fig 4.17 to derive this expression, whereas the fig 4.17 has no mention of \$R_{...
wolff's user avatar
  • 13
0 votes
2 answers
68 views

How can i obtain a positive Vref for this circuit?

I have to design a irrigation system that uses a resistive moisture sensor to maintain a certain level of relative soil humidity for a plant. In order to convert the resistance changes of the moisture ...
m3ll0w's user avatar
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1 vote
1 answer
64 views

Analyzing \$g_m\$ vs \$V_{in}\$ for a common source config

I had this doubt while going through the book "Design of Analog CMOS Integrated Circuits" by B. Razavi, if we are to plot \$g_m\$ vs \$V_{in}\$ for the above circuit, then we have \$g_m\$ =0 ...
wolff's user avatar
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0 votes
0 answers
94 views

What is the name and purpose of this part?

We disassembled an automatic electronic blood pressure monitor to find out its parts. While looking into the names and uses of various parts, I found that this part alone did not have a part number ...
FP EN's user avatar
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0 votes
1 answer
40 views

JK flip flop timing diagram

Is this JK flip flop timing diagram for the Q output correct? I just want to make sure I didn't mess anything up.
JP NICOSIA's user avatar
0 votes
1 answer
60 views

Solving for current flowing through R and reflection coefficient

This is my attempt at solving it. I'm not sure if it's correct, so I thought of asking for some advice. Image of circuit: Values: ABCD matrix: So I'm supposed to solve for the reflection ...
JohnnyB's user avatar
  • 49
2 votes
0 answers
64 views

Calculate the absolute value difference in work function for two diodes

Given two semiconductor diodes where one is silicon and the other is called Graham, and both are connected by ideal wires that do not affect their work functions, and they are also in thermal ...
Fourier_Asker's user avatar
2 votes
2 answers
75 views

How can I calculate the base current required for my multistage connected PNP transistor to obtain an obtain an output collector current Ic = 1.5A?

I need to design a circuit that provides an output of 11.5V with a current of 1.5A. This output is drawn from a TIP42 PNP transistor. The transistor gets its base input from a NPN2222 transistor. The ...
Coding247's user avatar
3 votes
1 answer
127 views

Is it possible to achieve a square root analog filter?

I am attempting to create a (3/2)th-order active low-pass filter circuit, with a zero[es] at ω=10000 and pole[s] at ω=100. The only way I can think to do this is to simply cascade three simple first-...
Jonas Fletcher's user avatar
1 vote
2 answers
145 views

How to go with this RC circuit?

So, i've been asked to get the differential equations (or model) for this circuit: V1=15 u(t)V, R1=10 ohm, R2 = 20 ohm, C1=10uF, C2=20uF I'm just a beginner, and don't know if the differential ...
Nicolas Guevara Herran's user avatar
-2 votes
1 answer
133 views

Solve problem about voltage drop [closed]

Can you please help find the voltage drops at 8 Ω and 20 Ω? Reference below.
Chatchavan Kamluecha's user avatar
0 votes
2 answers
566 views

Charging a mobile phone and laptop using wall plug - Series or parallel circuit?

I'd like to understand if charging multiple devices using the 240 V line's main power plugs forms a series or parallel circuit.
9_daytona's user avatar
2 votes
2 answers
108 views

Gain of a negative feedback circuit (problem)

I am asked to find the gain A for this negative feedback circuit below: (A: gain, G: all of the gain of the circuit, F: return ratio) The simplified circuit above shows the gain A that I am trying to ...
kauselis3000's user avatar
-4 votes
1 answer
75 views

Struggling with the math behind this [closed]

I have been trying to figure out how the wire resistance intersects with the rest of my calculations. First weeks of Circuits and I am lost.
Bennr's user avatar
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0 answers
38 views

RTE schematic diagram for battery with a load

I am trying to draw a schematic to get information for battery round trip efficiency. My equipment is: 1 x 5 kW battery 1 x 48 VDC power supply 1 x 48 VDC load (const current) 1 x DC shunt 1 x ...
Randy98's user avatar
2 votes
1 answer
140 views

LC Resonance with Inductor with Solid Metal core

Consider inductor with air gap and solid metal core made from material with relative magnetic permeability 1 regardless of temperature (such as copper or aluminium). There is Air gap between coil and ...
Fan's user avatar
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1 vote
1 answer
122 views

Linear system - causal and memoryless system (integral)

\$T{(x(t))} = \int _{-\infty }^{+\infty }sin\left(t+\tau \right)x\left(\tau \right)d\tau\$ Is this system causal or not? Is it memoryless or not? At first I thought it was not causal and with memory ...
Ben Shaines's user avatar
4 votes
2 answers
521 views

Impulse response of an RL circuit

I've got homework in the Signals & Systems class I'm taking, and I'm trying to find the impulse response to this circuit whose transfer function I've found. In the class we've done practice ...
m3ll0w's user avatar
  • 41
0 votes
1 answer
72 views

What is PDN in these questions?

I don't know what PDN stands for. Can you give me some hint to solve these problem. I'm appreciate.
South goodman's user avatar
0 votes
0 answers
156 views

Confusion about the initial condition for Laplace transform

I was trying to solve this question with Laplace transform, but I am confused in this question. My confusion is that whether we have to include the initial condition of the capacitor or not. Because ...
Preet's user avatar
  • 147
0 votes
1 answer
128 views

Two-port network

I have been trying to solve a problem on two-port network but I am getting two different answers: APPROACH 1: In the problem the Y-Parameter is given so I converted Y parameters to H parameters and ...
Preet's user avatar
  • 147
0 votes
2 answers
232 views

Implementing a circuit using only NAND-2 gates

I have this boolean expression that I got through a k-map twice, once using POS and the other SOP, and I am supposed to implement both minimized f's that I found using only NAND-2 gates but I am very ...
Salma Mostfa's user avatar
0 votes
1 answer
82 views

How to deal with one inductor coupled with two different inductors?

I'm fairly confused on how to deal with this type of a situation. I can easily solve circuits with one simple coupled inductor, but this case is obviously different. The task is to solve for the ...
JohnnyB's user avatar
  • 49
0 votes
0 answers
76 views

Complex equations in AC RLC circuits spiralling out of control

I'm trying to solve the following circuit. I tried using superposition to find Thevenin at V_o. First I solved for V_o with the current source and dependant source, then I solved for V_o with the ...
Tom Cajot's user avatar
1 vote
3 answers
241 views

How can I solve this dual operational amplifier circuit with nodal analysis?

I'm somewhat unsure how to solve the Uout voltage of the above circuit using nodal analysis. Uout being the voltage at the right side obviously. I'm not entirely sure if what I have done so far is ...
JohnnyB's user avatar
  • 49
1 vote
1 answer
114 views

Finding C and L in an L-type impedance matching network

I'm struggling with finding the values of C and L in the circuit above. I understand the point of the L and C, is to match the real parts of the impedances and eliminate the imaginary parts, but I ...
JohnnyB's user avatar
  • 49
1 vote
2 answers
181 views

Need help to guide the diode current question

Hi all, I am new to circuit calculation and need help to guide the question above. Much appreciate and thank you for spending your time and help! The question is "Calculate the diode current for ...
Guan's user avatar
  • 13
0 votes
1 answer
86 views

Op-amp with input resistance bigger than output resistance

I am trying to solve this problem, and even though the calculations are fairly simple I am getting a very strange result. I have compared what I get with what my classmates get and what Mathematica ...
coffee_pls's user avatar
0 votes
0 answers
46 views

Why +ve charge(conventional current) flows out of the -ve terminal of a battery?

Please consider question 45 part c. In this question if I consider that the capacitor after being fully charged at 24V is now connected to a 12V battery, and since some heat will be lost as charge ...
Aditya Mukherjee's user avatar
1 vote
1 answer
151 views

DC Thevenin voltage

The question I am trying to answer is: Find the Thevenin voltage Vth to the left of the 10-ohm resistor. I have determined Rth for the electrical circuit in the pictures (Rth = 5 ohms) but I am ...
Mustafa drees's user avatar
0 votes
2 answers
150 views

Why doesn't mesh analysis work here?

I am new to theory of circuits and I just learned about mesh analysis. When I was doing some reviewing, I stumbled across this question and wonder if you can use it here: I plugged the equation into ...
poopsalot15's user avatar
0 votes
0 answers
57 views

Circuits/Electronics class: Thevenin Equivalent resistance

I'm trying to find the Thevenin equivalent circuit for my circuit class. I got the voltage, but am stuck on the resistance. I attached photos of the og circuit and my attempt. I'm not sure if the ...
kklem1's user avatar
  • 1
0 votes
3 answers
84 views

How to solve current flowing through a component in a A/C circuit?

In that given equation j(t)=5sin(ωt)A , where ω=2πf and f=50Hz R=50ohms and C=100μF In polar form I=5/sqrt(2)//0° , where //0° indicates the phase angle Task is to solve the current ic(t). I tried to ...
JohnnyB's user avatar
  • 49
1 vote
1 answer
164 views

How do I go about solving the current I1 using Thevenin's Theorem?

I understand from here I'm supposed to solve the current flowing through \$R_1\$. So I have to remove the \$R_1\$ and add terminals A and B and solve the resistance between them? Would it be easier ...
JohnnyB's user avatar
  • 49
0 votes
1 answer
129 views

Solving for V and I in a diode circuit by making assumptions

I want to make sure I understand the solution to this problem from my textbook. The goal is to solve for V and I in the circuit below: They start by assuming that both diodes are conducting and solve ...
Hamza Beder's user avatar
1 vote
3 answers
160 views

Transient response of capacitor connected to current source with no resistor

I have this HW problem: It has me completely stumped because the usual equation for the transient response of a capacitor assumes the circuit has a voltage source, not a current source, and requires ...
Mikayla Eckel Cifrese's user avatar
0 votes
4 answers
437 views

Power Dissipation in an AC Circuit

I'm seeking clarification on power dissipation in an AC circuit with a specific scenario in mind. I was able to calculate the RMS current through the AC Mains = √10 A Considering that the upper ...
QuantumQuipster's user avatar
0 votes
1 answer
64 views

Applying KVL to a grounded MOSFET circuit

I'm rather confused as to how to how this circuit doesn't violate KVL: The two node voltages on the right side of the loop add to -4.16V, which means the voltages on the left should add to 4.16V, ...
Mikayla Eckel Cifrese's user avatar
4 votes
3 answers
2k views

Overdrive voltage of NMOS vs PMOS

I'm confused whether the overdrive voltage for an NMOS/PMOS transistor is supposed to be $$V_{ov} = V_{gs}-V_t,$$ $$V_{ov} = V_{sg} - V_t,$$ or $$V_{ov} = V_{gs}-|V_t|$$ and whether it matters ...
Mikayla Eckel Cifrese's user avatar
0 votes
0 answers
48 views

Need help in understanding circuit of PMOS reverse

Given 2 PMOS enhancement: Vdd = 5 V, k1/k2 = 9, Vt = -1. I'm trying to find Voh, Vol, Vil, Vih. I would appreciate help and explanation.
roi sh's user avatar
  • 1
0 votes
3 answers
289 views

Getting wrong answer for mesh current analysis

The circuit diagram is given below, I keep getting the wrong answer for the mesh currents, I always get -1 for first loop and -7 for second loop. Therefor Ix comes out to be 6 which is wrong. It ...
Rizwan Liaqat's user avatar
0 votes
2 answers
78 views

KCL in a particular node (problem)

Above is an AC circuit in which terminals A and B are used to connect to a load. I am asked to find the equations for currents coming into and out of nodes 1 and 2 (using KCL). I had no trouble ...
kauselis3000's user avatar
0 votes
0 answers
68 views

How do I calculate Io and n from the Shockley equation given two operation points?

In this exercise I'm given the Vd and Id in two operation points and I need to calculate Io and n from the Shockley equation. I've tried isolating Io and replacing it in the other equation but then I ...
Gabriel Corrales's user avatar
0 votes
0 answers
130 views

MOSFET circuit operating point

Yesterday I spent about two hours trying to calculate the operating point of this circuit without success but I can't accept my defeat. The exercise asks to: "Complete" the operating point ...
RitterTree's user avatar
0 votes
1 answer
191 views

Need help to find Thevenin resistance and Thevenin voltage

Here is the question I am trying to solve(there are 2 things I need to find. These are Vth and Rth): Here is my attempt: ( please check Vth if it is true ) I couldn't find Thevenin resistance at all ...
Computengineering's user avatar
0 votes
1 answer
83 views

Why do I get two different transfer functions for the same gain?

I'm trying to derive the expression for \$ A_X = \frac{V_X}{V_{IN}}\$ but I'm getting two different ones relatively to the \$KCL\$ I use to calculate it. With \$ KCL \; A)\; -\frac{V_{IN}}{R_S} = \...
RitterTree's user avatar
0 votes
0 answers
72 views

Triangular-wave to sinewave converter with symmetrical circuit

I don't think I have a solid approach when analyzing complex circuits like these. I hope some of you can give me general directions and help me tackle this one. Given that the diodes are ideal and \$...
RitterTree's user avatar

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