Electrical Definition and 1000 Threads

I wasn't sure where to put this. The other night my electric heater turned itself on. It's a duraflame fake fireplace heater. It turned on, the flames turned on, it was 85F at the time and the unit was off, but plugged in. At the same time in a different outlet my internet and tv turned...

I have doubt. Is it possible to convert DC motor to Stepper ? If yes then what is the procedure ?

I'm pursuing a MSEE, I was wondering how much GPA matters, if it matters at all? Please be honest. I'm questioning it, because my credits towards my degree do not expire until they are six years old. Should I use the time from which I have enough credits to graduate and earn my degree to the...

I have noted three different phenomena due to high electric fields in air. 1. When I run a ten-stage voltage multiplier I get sparking and crackling. 2. When I run the multiplier but current limit the output with ten 720k resistors in series, I get a violet arc that is sometimes smooth and...

What are the scenarios for the ATS (Automatic Transfer Switch to operate?)

Homework Statement https://pasteboard.co/Hj3g5Km.jpg When both switches 1 and 2 are closed,what is the total resistance of the set up? I couldn't figure out which resistors are connected in parallel and which resistors are actually in series in this set up when both swtiches are closed. I...

Hi, I am working on Maxwell version 17. I have a simple motor to analysis 2D FEM. However, when I analyze the model, I see this error. "Maxwell2d solver, process solver2d error: Internal Solver Error: 'Transient solver handles only isotropic conductivity!'. (7:07:10 PM Apr 16, 2018)" I am...

A circuit contains a 7.5V d.c power supply and three resistors. The total resistance of the circuit is 30 ohms. Why will the largest current in the 18 ohm resistor? As far as I know is that the smallest current will be in 60 ohm resistor because it has the maximum resistance. Please explain...

When the eletctric field was defined I could totally relate to E is like g in mechanics. But for the electric potential I don't know. What would be equivalent analogy?

I came across a contactor catalog saying "Definite purpose". Then tried to figure out the types of contactor. Came across definite purpose and general purpose. What is meant by definite purpose contactor and general purpose contactor? On what basis can i choose definite purpose?

Dear friends, does anyone know if there exists any study about electrical conductivity of liquid argon? Thank you in advance for any suggestion.

Hey all, I am currently torn between West Virginia University (WVU) and University of Pittsburgh (Pitt) as far as school choice goes for my undergrad in Electrical Engineering. From everything I am reading online, Pitt is the better school academically, but I would like some input from some...

Hello people. I recently finished studying mechatronics engineering. I decided to pursue this degree as I wanted to learn about many areas of engineering. When I chose this degree I just could not make up my mind on which side of engineering to follow so I attempted to go after everything. At...

for instance. Let's say we have a positive charge and a negative charge. and i do 30 joules of work to pull the negative charge away from the positive charge. now it has 30 joules of electrical PE. I release it. All the turns into KE as it flies back towards the positive charge. once it...

Hello Friends! Which company do you recommend for a solid hands on short term training(1-5 weeks) in Europe/Asia for electrical engineers? I wish to get a solid training in one of the following areas: 1- Industrial control system and automation 2- Building installation (data + power) 3-...

Hi all, want to realize a system for a PCB which holds a solenoid coil moving in a vertical axis long about 600 mm. The coil must get electric contact only in some predefined positions so that, for a given quote, the coil connects to a different LC circuit for having different resonant frequency...

Single wire electrical energy transmission without a (ground ) return path... A new way of transmitting electrical energy from a floating totem pole node to almost 500 miles away end point of propagation... My totem pole electric charge supply is made of a high voltage battery and two switches...

Hi I am an electrical engineering student, would like to do research and or a thesis in electrical power engineering. However, because our university does not offer any courses on this topic, I am left alone to peruse the books and literature and find some topic of interest. do not know if this...

As a hobby for the last couple of years, I've been designing various theoretical wave and wind generator devices. One of the primary criteria is that the electrical power generation components have to be easily accessible. For wave power, electrical power generation has to be on shore not in...

I am currently active duty military and an aspiring physicist(probably theoretical but I haven't decided). I'm planning to take college classes online but there aren't any accredited physics degree programs that are online (at least that I found). The next best thing that I can find are 2...

<< Thread moved from a technical forum, so no HH Template is shown >> Our teacher gave us a lab, and we have to write a procedure on how to test the electrical conductivity of multiple substances. However, on the materials, all that was written was "electrical conductivity tester", which I'm...

Homework Statement A charge of 2 C is located at the origin. Two charges of −1 C each are located at the points (1, 1, 0) and (−1, 1, 0). If the potential φ is taken to be zero at infinity (as usual), then it is easy to see that φ is also zero at the point (0, 1, 0). It follows that somewhere...

I know that energy cannot be created nor destroyed. However, I also know that voltage is basically electrical potential energy. So, how can a transformer exist? In terms of classical mechanics, in order to increase the PE of say, a ball, you must lift it (expending energy) higher above the...

So, when you bring a charged object near for example a soda can, I get that the soda can gains a positive side and a negative side, but the can also moves towards the charged object, why is that? Is it because if you put a negative charged object near the soda can the side of the can nearest to...

Any clue to to show that it is 10kW? Please tell me where i went wrong and thank you. I tried and i just couldn't figure it out.

Good day I've been the task of designing an electromagnet to remove ferrous material from ore mixture. I've calculated the flux density require to remove the particle from underneath a burden depth of 400mm; which is 792.7177 Gauss. (Force index is: 1.5710*10^6 G^2/m) However what I've been...

There are 2 types of temp rise measurement for electrical devices, 1)resistance type 2) thermocouple type (direct measurement) My query is 1) which method is superior and please explain me the reason. 2) Which gives higher value of measurement? Thanks in advance.

Hello Before I start, I would like to clarify that I know Perpetual Motion is not possible & Energy can neither be created nor destroyed, But Can be change from one form to another. That's exactly my point. If I could convert energy from one to another, then why couldn't I just harness energy...

Homework Statement Calculate the electric field at point ##P## if the distance from the center of an infinitely long, charged rod to point ##P## is ##a = 0.6m##; the charge density equals ##\lambda = -CX^2##, ##C=10^{-3}C/m^3##. Show all steps in finding the equation of the field, then find the...

Homework Statement Homework Equations In Capacitance current leads voltage In Inductance current lags voltage For oscillations R = 0 3. The Attempt at a Solution Since current is leading voltage in above question, impedance is capacitive. Book answer is D for both. How? And for 3rd...

Can someone explain the math of how potential energy travels from higher potential energy to lower potential energy (PE) along a uniform electric field? I understand that in order for the point charge to move, gaining kinetic energy, it will lose potential energy. But using the equation...

what is difference between electric field and electrical charge?

Homework Statement Lets say I have two objects, with the same mass, m, and charge (+q), with a distance r between them. They repel each other due to electrical force, but they are attracted due to gravitational force. My questions is: What should be their mass m such that they feel no net...

How does electrical current have energy? (when electrons move very slowly through circuit)? (mentor note: removed cross link)

I'm having trouble seeing how electric potential energy production on a conductor follows conservation of energy. Let's use the photoelectric effect as an example. A photon with energy E = hν strikes a conductor, ejecting a photoelectron with a maximum kinetic energy of hν - φ. Assuming the...

I'm interested in what kind of energy has electric current ?. For everything I taught in school should have kinetic energy because electrons are on a certain potential within the electric field when the switch is closed then the electrons move and the electric current is "generated" which then...

The following circuit was created. I would be very grateful if you could check that the what I have said about it is correct. "A phototransistor was connected in a series circuit as shown below. It is used like a resister in this case with a battery and multimeter measuring current. When the...

Greeting . how electrical energy can be power over time when electrical energy is actually potential energy . from a lot of sources (wiki ,study.com..) comes the information that electric energy is potential or kinetic energy in other sources is said to be electric power p x t so i am...

Homework Statement Homework Equations V = I.R The Attempt at a Solution 6 ohm and 3 ohm are series = b Then b pararel to 9ohm = c = total resistance b = 9ohm c = 9/2 ohm I = V/R I = 9.6/c I = 2,13 A Can you help me? Is it right? My friend's answer is 0,8

Hi all, An interesting old device for you, circa 1984. It comes in a nicely varnished plywood cabinet: To restore it, I had to do some cabinetry to fix some broken seams, and a relay had gone bad inside. All working now. On the inner lid is a sheet with full operating instructions. On the...

Hi guys, can someone please have a look at the following problem that I am struggling with; An 8.25 kW shunt DC motor is supplied with a terminal DC voltage of 300 V. The armature resistance of the motor Ra is 0.25 ohms, and the field resistance Rf is 40 ohms. The field winding consists of 1500...

Given the circuit, I am supposed to find the total resistance, but I am unsure of what to do without having a voltage or current source with an internal resistor.

Homework Statement I need help with part b- A buck regulator is supplied from a 12VDC source and outputs 5VDC at 4 A with a PWM switching frequency is 100 kHz. Answer the following then: a- Determine the continuous conduction mode inductance (L_CCM). b- Compute the inductance for the...

I’m hoping that I can find some career advice that can shine some light on my situation…I served in the Navy where my primary duty was working with the ships radar and communication systems as well as providing support with other electronic warfare systems. When I discharged from the Navy I got...

Homework Statement A circular loop of radius a and resistance R is placed in a changing magnetic field so that the field is perpendicular to the plane of the loop. The magnetic field varies with time as B(t) = B_0 * e^(-t) where B_0 is a constant. Determine the electrical power in the circuit...

I recently watched this Varitasium video where he explains the magnetic field due to a current carrying wire. In the video he explains how what we see and describe as the magnetic field produced by a current carrying wire is actually just a electric force caused by the an imbalance of charges...

I've had a side project in mind for a while involving motorized Rollerblade wheels, however I need to figure out a motor size that would give me the needed torque to actually accelerate 250lbs up to 25mph. I realize even a 5hp electric motor is large but I was wondering if ohms have any affect...

Homework Statement A 10-km-long underground cable extends east to west and consists of two parallel wires, each of which has resistance 13 ohm /km. An electrical short develops at distance x from the west end when a conducting path of resistance R connects the wires (Fig. 27-31). The resistance...

Hi. Maybe you can help me. I am reading history of physics, especially the moment when Maxwell completes Ampere's law with the displacement current. My doubts are about propagation in a vacuum. 1. Can I say that in an electromagnetic wave there are several undulating fields, one of them the...

how does electric motor convert electrical energy to mechanical energy. Hello I do not understand the following electric power is P = V * I electric motors operate on the principle of repulsion and attraction of magnetism. What confuses me where that power ends because as far as I know, the...