Electrical Definition and 1000 Threads

hi, I am planning to go to grad school for bme but also interested in electrical engineering. So before going to grad school, i want to take some useful and potential prequisite courses. Are there any you guys can recommend? Thank you!

Hi, I noticed that there are many subdivisions under EE. I was wondering whether I could get some information on each discipline like what there are applications are and there need in industry. Thank you

Homework Statement a mass of 15kg of air in piston-cylinder assembly is heated from 25°C to 77°C by passing current through a resistance heater inside the cylinder. the pressure inside the cylinder held constant at 300kPa during the process and heat loss of 60kJ occurs. (Cv= 0.718 kJ/kgK)...

I haven't made my official major change yet, but I want some advice. So I transferred from a local community college to go into Electrical Engineering. I went into it, and I sucked at "hands on" activities in EE. Building circuits just didn't seem like my thing. I mainly went into Electrical...

So what actually is the cause of electrical Resistance?

Hi guys and gals, I'm an EE major working towards my bachelor's degree, I would like to apply to PhD programs when I'm close to being finished or finished with my bachelor's. I need advice for some schools to consider and if I'm on the right track to an alright school. Reader's digest at end...

Hi to all. I'm looking for ways heat could be converted directly to electrical energy. I figured out some machinery out there that can convert heat to electricity by difference between temperatures, but this method seems to be inefficient. I just came with an initial idea of how a new machine...

In my country, the Electrical distribution box has two sections lighting section 300 mA and power section 30 mA why the lighting section taking more current than the power ?? Shouldn't the power take more ??

Hi All: I am an electrical engineering undergrad. I would like to learn a math plotting software which would be helpful in visualizing topics in advanced calculus (my immediate need). It would also be helpful if the math plotting software was of some use in electrical engineering, but this is...

Hi. I have no idea how to do this. It's complicated because the length here is a variable. I posted the same question before but there was a little mistake so I am reposting this again. The picture below shows the potential due to ring charge. Please show the full steps of deriving the...

Homework Statement Given 3 point charges as follows: 1) a +2.5uC charge at (-0.20m , 0.15m) 2) a -4.8uC charge at (0.50m , -0.35m) 3) a -6.3uC charge at (-0.42m , 0.32m) What is the electric field at the origin (0,0)? Homework Equations E = (k * q) / (r^2) (To find the...

How do transmitters convert electrical signals into photon energy?

Hello, I am wondering about average (real) salary in electrical engineering field in USA (and another countries), especially at microelectronic and SoC design. Out of my curiosity I also would like to ask about teachers salary. Is there anyone who could give me some insight, if my question is...

Hi, I have two questions that I want to solve correctly... and help is a appreciated. 1. Is the current direction/Poles on right figure correct? https://www.dropbox.com/s/bs3lvak4wda5lqu/23.png 2. This one I'm sure is wrong... not too sure what I'm doing here... Are the currents correct...

A ideial voltage source has: v = v i = ? R = 0 L = ? C = ? ideal current source: v = ? i = i R = 0 L = ? C = ? ideal resistor: v = R i i = 1/R v R = R L = ? C = ? ideal inductor: v = L i/t i = 1/L vt R = 0 L = L C = ? ideal capacitor: v = 1/C it i = C v/t R = 0 L = ? C = C *assuming that v...

What's the mechanism behind things like sparks, lightning, St. Elmo's fire, etc.? I've heard two different explanations, both of which seem reasonable: 1) Stray electrons are accelerated by the potential difference created between eg the thundercloud and the ground. These electrons attain...

Which are all the possible combinations of chemical elements that a common people can use for manufacture an electrical cell that no needs of special care? (say me from better to worse, please) Also, the combination Zn/Cu is the standard combination or is just a combination among several...

E=mc² shows the relationship between matter (mass) and energy, but another elementary information in the atomic physics is the electrical charge. So exist some relationship between energy and electrical charge?

I was thinking, a circuit don't need necessarily be a circuit, can be something like this: How compute the voltage of a circuit if the voltage of the source is different of the sink? Also, how compute the voltage, the current, resistance, etc, of a circuit when we have various sources and...

Hi. I am very much interested in physics but my locality lacks good college for undergraduate physics but has good engineering colleges. I was thinking of taking up electrical and electronics engineering hoping that it is related to physics. I need advice if I can take up particle physics or...

Hi guys, I am 30 years old, I work pretty much full time and I am working towards my EE degree slowly right now at a local community college. I took Calc 1,2,3 finishing Diff Eq now during summer semester, took engineering physics too (1st of 3). It is difficult stuff just due to time...

Hello. Electrical conductivity is written as \frac{n_{e}e^{2}}{m_{e}\nu_{ei}} where n_{e}, e, m_{e} and \nu_{ei} are for electron density, charge, mass and electron-ion collision frequency. According to Wikipedea, http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity Unit...

I am a second year civil engineering student. I decided long ago since I was in high school that I would be in engineering. However I only chose civil because I couldn't decide which engineering disipline I should choose. My college only has 4 course in engineering including computer eng. A...

Even as a kid, I saw beauty in old devices. That made me want to understand how they worked. I had lots of old things that I keep and now reviving. Old things need to work to see the beauty. Here's what I've done so far. Two views of the gadgets shelves and my small work space...

I understand what Computer and Electrical Engineering are in the sense that computer engineering is electronics and some programming and electrical deals more with hardware whether it's power lines or electronics. What I want to know is whether or not one job market is better than the other. I...

I have been installing lighting from a 3 phase board. The wiring schematic has instructed me to place an l1 and l2 feed into the same switch box. Is this not bad practise? Would it be better to put 2 L1 feeds to it instead? Therefore there would only be 230v at the switch. Also , am i correct in...

Homework Statement Hi, I just need some confirmation on this question on whether it is correct or not. Homework Equations P= V^2/R. Based on that circuit I was asked to complete the following table and then find the power of the circuit. The Attempt at a Solution To find power I did the...

Which one is worth more? I don't have much money, and I'm not the type of guy who will get a scholarship. So I want to have a great start in my career. I also want to be financially stable. So what degree should I pursue? Phd or master's?

My goal and dream since I was 16 was to study engineering physics at a certain university. I just loved the idea of combining physics (both theoretical and experimental) with the practicality and applications that come with being an engineer. However, due to various factors which I won't get...

Hi I need best calculator for electrical engineer ( communication or computer networks) I think ti-89 for DE solver read about casio and hp but still need advance for pro. Thanks

Hello everyone, I need advice related to my career. I have been working in semiconductor company as an engineer for 2 years now after gradating from IIT Madras(one of the reputed technical institution in India) with a Dual Degree(BTech + MTech in 5 years) in Electrical Engg with VLSI as...

I've done a school experiment converting electrical energy to heat. P=VI was used to find the electric power going through the Ohmic heating coil, and got an answer of 30 watts. It was used to heat 0.2kg of water and the equation Q/t = m×c×T/t was used to find the Heating Power which gave an...

Homework Statement Estimate the electrical conductivity, at 135°C, of silicon that has been doped with 3 x 1024 per meter cubed of aluminum atoms. Assume values for electron and hole mobilities of 0.03 and 0.007 m2/V-s, respectively. Homework Equations σ=|e|(ne*μe+nh*μh)...

I have recently been learning about the microscope properties which dictates electrical resistance. The main equation (resistivity) in my textbook is: \rho = 2m/qN\tau where \tau is the time between collisions of electrons with the atoms, q is the charge of the electron, N is the number of...

Hello PhysicsForum's, Over the last couple months I've been studying electrical engineering and I think I have pretty good grasp of the basics. I am a computer programmer so dealing with math and logical problems are not foreign to me, however, I've hit a road block. I realize now that I can't...

When households are said to be grounded using an Earth wire, electrons are supposed to flow to the ground because the ground is at zero volts. For example, if your the live wire touches the metal casing of your toaster then the Earth wire takes the current to ground. But isn't a lot of household...

Dear all, I am this dilemma. I found out that I am not suitable to be a physicist. I want to be an electrical engineer but it is too late to change to ee now. My plan is to finish my degree in Physics and Applied Math, then apply ee for master. I want to know how can I do it, in order to...

So I was just looking at graduate EE specializations and found some that interests me. I was just wondering which ones would have the best job markets. Electronics Circuits & Systems: Analog Circuits or Digital Circuits Power Electronics & Power Systems: Power Semiconductor Devices, Power...

Greetings. I know what both electrical and computer engineering entail as majors. I just wanted to get some feelers on what some people think would fit me best. I've always been really interested in circuitry and taking apart small devices. I don't really have any experience working on...

Homework Statement A positively charged glass rod is brought near to (but not touching) a neutral metal teapot. What will be the charge distribution on the teapot? Homework Equations None The Attempt at a Solution This is a multiple choice question, and the possible answers are: -Excess...

Do such materials exist? If they do, are there materials that go from very high to very low thermal conductivity depending on electrical input?

I've tried searching for it but while there are a lot of hits on the fact that graphene's conductivity is high, there seem to be very few on how the conductivity is actually measured. Would you use the same method as you do with metal wires? Using cross sectional area, length, an ohmmeter...

Can someone give me a lead for acquiring books for electrical engineering? I want to learn electrical engineering, but I would be starting from scratch and would like to purchase books to teach myself. Any info would be much appreciated! Thanks!

Hi, could someone explain how energy and voltage operate in an electrical circuit. I'm really confused because I was reading a book on misconceptions in electric circuits which said that energy is not associated with the charges in a circuit. It goes on to say that if it did then you would have...

edit: I see that my title is incorrect. This isn't between charges, it is between a charge and a point, sorry about that. The problem: Find the magnitude of the electrostatic force that works on a point 3 meters from q1. q1=3μC My attempts: Feq1=1/(4πε0)*(q1/r) r=3m 1/(4πε0)=8.988x109...

The problem is to find the potential at a point that is 3 meters away from two charges. (one 3 meters above, and the other 3 meters below) q1=3μC q2=6μC I put that Ep=Epq1+Epq2 Epq1=K*q1/r1 Epq2=K*q2/r2 K=1/(4πε0)=8.988x109 This gives me: Epq1=8.988x109*(3x10-6/3)=8988J...

Homework Statement Hello, I am having trouble with a physics lab report I'm working on. I'm going to try and be as clear as possible. Basically, I'm using different values of R and C in determining tau, the time scale in a circuit's behavior. I used a circuit with a resistor and capacitor and...

Hi, could someone direct me or recommend me some materials which deal with those problems? I would like to get deeper understanding of it (I know it requires qm), see how exactly such things happens and be able to quantify it (not just with phenomenological theory). For example when I get...

done editing Homework Statement I'm given the following transfer function that represents a physical apparatus G(s) = \frac{X(s)}{F(s)} = \frac{3.333*10^{4}}{s^{2}} I'm asked to design a lead compensator to achieve closed-loop stability. The requirements are that it must have a transient...

1.What do watts do and how do they affect an electrical device like a motor? 2. what do amps do and how do they affect an electrical device like a motor? 3. what do volts do and how do they affect an electrical device like a motor? I understand what these measurment are and how to solve for...