Homework Statement
y(t) = x(1-5t)
Homework Equations
noneThe Attempt at a Solution
well I've never looked at the stability of a signal which has a time scale and shift. My guess is that it is stable as anything I can provide as input will output a bounded signal.
Ex: if x(t) is u(t)
then...
Good evening, it's been a while since my last thread here in PF. I will go straight to the point:
I want to measure temperature using an NTC3950 thermistor. My circuit diagram is as follows:
It's basically a voltage divider. By varying the temperature acting upon the thermistor the output...
Good evening everyone,
My name is Ricky and am in my first year in becoming an electrical engineer at Olympic College in WA. I am in a technical communications and need to write a discourse community analysis paper. Part this paper is interviewing someone with at least a BS in electrical...
I'm interested in the following general question: Assume x,y,z is an axes system, and that the y-z plane is occupied by a conductive plate at a known potential V with respect to the earth. Now, a conductive material M of neutral global electrical charge is placed at some distance of the plate...
There is some controversy as to why the spectral content of vinyl records contain frequency "information" above what the analog tape recorder was capable of capturing.
A thought experiment:
If I have a piano that has a key which plays 15khz (primary freq. of that key's piano string), what...
Homework Statement
sorry just started my hnc in engineering and electrical the worst part for me
is this right
a current is applied a magnetic field is generated. current is reversed zeros its repeat. metal maintains degree of magnetizem dipole aligment. the magnetic field lags behind the...
Homework Statement
I have a current source of 2mA in parrallel with a resistor of 9.2kOhm and a short. What is the current through the short?
Homework Equations
The Attempt at a Solution
I always thought shorts had an infinite amount of current but maybe I do not quite understand the...
Hello, I've got two computers that are in separate rooms and I have placed plastic conduit through the small space above the ceiling. Which will have a USB data cable, an Ethernet network cable, and a HDMI cable inside. The conduit length is about 8m long. And I was wondering if this setup could...
Dear Sirs,
If I take this explanation as being true "The heat is generated on the microscale when the conduction electrons transfer energy to the conductor's atoms by way of collisions."
So a "current" must have a quantum of kinetic energy going into the conductor (resistive element) and a...
Homework Statement
One of the two glass panes in each window is coated with a transparent electrical conductor. Why does this coating improve the window's insulating ability?
Select one:
a. The transparent conductor is black in the infrared, with a low-temperature emissivity of almost 1.
b...
This thought experiment has been bugging me for a very long time - I'm hoping someone can help me understand it.
Premise:
- Simple DC electrical circuit consisting of a battery, wire, light bulb, and another wire to complete the circuit.
- Each wire has a length of 1 light-year (yes, very...
So I have been wondering:
The potential for a point charge at the origin, is described as:
(Using the reference point at infinity): V=1/(4πε) * q/r
My question is, what happens to this Potential the closer we are to the point charge, and so the closer we would get, the Potential seems to go...
How is symmetry used to solve electrical circuits? I have seen several problems in books in which currents in two resistors are said to be equal due to 'symmetry'. That is a concept that I fail to understand and thus cannot apply. In class, we were shown a few circuit diagrams which were...
Can anyone recommend a place to find case studies in electronics design? I am looking for concrete examples of the engineering process from requirements definition through PCB layout.
As a physicist who designs instrumentation I would like to improve my improve my design process and employ more...
I have been looking everywhere for a clear explanation for the following: How do I know which way to integrate the electrical field, when I'm looking for the potential between to points?
Example:
I have to find the potential between the top conducting plate and the bottom conducting plate...
Hi, I’m a freshman Physics major in the US and I am concerned about the job opportunities directly out of undergrad. Because of this, short of switching my major to an engineering field, I was wondering if a minor in EE would substantially assist me. I know it would not be an ABET accredited...
After watching a video on YouTube, I recently became interested in the dynamics and physic's of why we aren't using electrical powered planes instead of burning thousands of fossil fuels every day. After doing a bit of my own research, I found the problem. When we increase the weight, we have to...
Homework Statement
Homework Equations
P=V2/R
For maximum power transfer,
Rload=RThevenin
The Attempt at a Solution
I know the efficiency is 50% during maximum power transfer. So when all the sources are acting simultaneously and ( at the same time) R=Rth, maximum power will be dissipated in...
Hi,
Is it true that the transmission of energy is not inside an electrical conductor, but outside the metal. this even for frequencies around 50 hertz.
Thank's
Do electrical engineers actually use stuff that is taught in Circuit Analysis classes like Node Voltage Method, Mesh Current Method, Kirchhoff Voltage/Current Law, Source Transformation. All these usually only involve resistors. Are they somewhat altered in a way to analyze circuits with other...
Homework Statement
10 v, 100 hz goes into a circuit of a 1o resistor, a 1o inductive reactance and a 1o capacitive reactance that are in series.
What is the current. What is the V across the cap.
Homework Equations and the attempt at a solution[/B]
So I know I = V/Z and Z = sqrt( R^2 +...
We most often witness the presentation of quantum dots in viles or containers which are excited via UV light.
I am more interested in their electrical excitation.
Could I simply take a sample of QDs from one of those viles and passing an electrical current through that sample excite the...
I comprehend that the above statement is not phrased as a question even though it contains the appropriate symbol, and that is because even if it was, and an appropriate answer was given, i believe i still would not be able to make a decision. It is more a reflection of my current mental state...
Hi lads,
I couldn't find this info on Google...
Are the Heart and Brain the only organs which physiological functions are based on electrical impulses?
What happens if we apply electrical current through other organs?
Thanks
Some spiders are known to fly on the breezes by extruding silk strands (like web material) from their abdomen. This is commonly thought to be caught in the wind and carry them away. This would explain the occasional spider you might see drifting by when you are outside.
Many (including that...
Hi,
I'm sorry if this question's been asked before but I was wondering how hands-on electrical engineering can be.
Are there jobs where an EE can find themselves doing designing and getting to work with their hands?
I find the theoretical stuff interesting as well as the more hands-on work.
The Faraday effect is a magneto-optical phenomenon caused by the interaction between light and a magnetic field.
Is there a corresponding electrical-optical phenomenon, caused by the interaction between light and an electric field?
Homework Statement
From Griffiths Third Edition: "Introduction to Electrodynamics" p.p. 81 ex. 2.6
"Find the potential inside and outside a spherical shell of radius R, which carries a uniform surface charge. Set the reference point at infinity.
Homework Equations
V(r) = -∫E⋅dl
The...
I'm in year 11, doing Physics for GCSE and my actual ending GCSE is on Friday which Is where I finish school.
I'm 16 and in the UK, I need help with the following equations:
P = I^2 x R (why is this equation used)
- all the power equations
- How to calculate uncertainty
<< Mentor Note -- OP...
OK, so my last post seemed meaningless.
Can anyone help with this, I understand some of you say current moves from the positive terminal of a battery to the negative terminal and some say the opposite.
Lets say it is positive to negative just for this question.
If I have a battery that the...
Thank you for your time and effort. It is much appreciated.
1. Homework Statement
I have attached the problem with the solution to this thread. Basically, the problem asks to construct the circuit model for a generic device by using the data of terminal current and voltage measurements. From...
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Lectures: http://www.nptel.ac.in/courses/117106030/
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Lectures: http://www.nptel.ac.in/courses/117106030/
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Lectures: http://www.nptel.ac.in/courses/117106030/
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Lectures: http://www.nptel.ac.in/courses/117106030/
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