Electrical engineering Definition and 204 Discussions
Electrical engineering is an engineering discipline concerned with the study, design and application of equipment, devices and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electrical power generation, distribution and use.
Electrical engineering is now divided into a wide range of different fields, including computer engineering, systems engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, electronics, and optics and photonics. Many of these disciplines overlap with other engineering branches, spanning a huge number of specializations including hardware engineering, power electronics, electromagnetics and waves, microwave engineering, nanotechnology, electrochemistry, renewable energies, mechatronics, and electrical materials science.Electrical engineers typically hold a degree in electrical engineering or electronic engineering. Practising engineers may have professional certification and be members of a professional body or an international standards organization. These include the International Electrotechnical Commission (IEC), the Institute of Electrical and Electronics Engineers (IEEE) and the Institution of Engineering and Technology (IET) (formerly the IEE).
Electrical engineers work in a very wide range of industries and the skills required are likewise variable. These range from circuit theory to the management skills of a project manager. The tools and equipment that an individual engineer may need are similarly variable, ranging from a simple voltmeter to sophisticated design and manufacturing software.
Good morning,
I need some help solving those two question. I've attached my attempted solution below. Could i solve the transfer function any further?
Thank you for your help
Summary: Trying to self-teach Electrical Engineering, Embedded Linux and AVR/ARM to make a career change into embedded systems development and I need suggestions on the best way to do that. I have a plan but I honestly have no idea if its a good one.
I have been into computers my whole life...
The image i provided is a section of microcontroller circuit that i used to interface code in C with the I/O port of the microcontroller, in Proteus.
I have realised i was only ever told to learn how to measure the voltage and current across the components, Kirchhoff's rules and all, and...
Summary:: Hi, I tried attempting this problem in alternating current in order to find out the phasors as complex numbers, and I would be more than grateful if someone could peer review it, and confirm my calculations (Please see below both the Figure and the calculations)
Please find attached...
I want to create an LC circuit with varying inductors and compare those inductors for efficiency. Would it be accurate to suggest measuring the area under the curve of the first cycle of the resonant frequency would determine which of the inductors are most efficient? If the area is greater...
Hello everyone,
I am looking at two master's degree programs (graduate school) : electrical engineering and robotics. Taking decisions is hard, and I would gladly like some advice making up my mind.
I have a bachelor's degree (undergrad) in electronics and electrical engineering, which grants...
So I've been absolutely stumped on this one. I've tried about a million different things but none of them have seemed right. A combination of the odd layout of the circuit, and a combined voltage/current source are making things really complicated for me. I'm somewhat sure the RTh is 15kΩ due to...
So I've just learned Norton's Theorem and I have this problem on my homework assignment that is wrong. I've checked the answer with a circuit simulator(PSPICE) and the simulation said that V0 should be a drop of 2V. However, my simplified circuit shows a voltage drop of 4V. I have been staring...
The study material says under 'Estimation of magnetising losses' :
On no-load, the rotor current is very small and the slip almost zero. Therefore, R′2s is very high and virtually no current flows through the branch of the circuit containing R′2s. Consequently, the no-load current is virtually...
Summary:: Electric Power Systems book recommendation
Hi everyone, I finished my Electrical Engineering degree 15 years ago and wanted to refresh/review/update my knowledge on Electrical Power Systems.
I'm looking for a book recommendation that has: components of a power system, control of...
Hi everyone, sorry we are talking about pulsed power accelerators again. In this context, it is about the HERMES III again.
According to https://apps.dtic.mil/dtic/tr/fulltext/u2/a351472.pdf HERMES III, a 16 terawatt pulsed power accelerator at Sandia National Labs, which fired electron beams...
These pictures below show four isodose contours of HERMES III with different anode-cathode gaps. The radiation produced are gamma rays. More informations can be seen here in the article https://www.osti.gov/biblio/6233581-hermes-iii-gamma-ray-facility-simulation-technology-laboratory-guide-users...
Hello friends,
I have a problem with a exercise sheet. Given is the impulse response of a discret element. The task is to draw the block diagram. But I think that the solution in the sheet is wrong. Because based on the difference equation (Exercise.pdf) there should be 3 delay elements. I have...
Can someone give me some insight into what would happen at the motor terminals and on the line if 2K2 (run Contactor) and 2K3 (auto xfmr wye contactor) were to close simultaneously. There are interlocks to prevent this, but I would like to know out of curiosity. My theory is that you would have...
I don’t know the ratio of the CT. I’m just looking for an explanation on this. I thought in order to measure output voltage you need to pass the current through a resistor and read the voltage drop.
A co worker put 400a through the CT and measured 130v. Something just seems off to me. Can you...
I’m self taught so I have a lot of holes in my understanding. I also have little to no mathematical understanding. Even though ironically, I tend to prefer to picture electricity as numbers rather than “water” in a pipe, etc.
I’ve been studying displacement current recently and have a question...
I was asked to use De Morgans law to find the complement of a particular equation, I applied the law correctly and simplified my solution down to
A'B'CD'+CA+CB'+D'A+D'B'
I ran the problem through a boolean simplifier to check my work...
If I am given an H bridge circuit such as that below:
How would I go on analyzing it? I would personally replace all of the transistors by their circuit models but then what would I do with the motor? Do I replace the motor with it's load resistance or is there more to it? I guess motors are...
the image is given here along with some numerical information:
Now I know that the formula for the electric field in a capacitor is given as:
$$E = \frac{V}{d}$$
which I can use to obtain the three following fomulas:
$$E_1 = \frac{V_1}{d}$$
$$E_2 = \frac{V_2}{d}$$
$$E_3 =...
The circuit to be analyzed is shown below:
Since initial conditions are zero (from the instructions) I will use laplace transforms for the cirucit and I will use the MAME method to solve this circuit. The laplace transforms that are required will give me:
$$E_g(s) = \frac{10}{s}$$
$$ L_3...
I seem to be in a minority for thinking that mechanical engineering is more difficult than electrical engineering. Difficult for me, I mean.
To me, mechanical engineering is more difficult largely because in mechanics your intuition and common sense are often trying to mislead you. With...
How do you calculate the reluctance of An electromagnet that consist of a nail with bare copper wire wrapped around it? I have tried searching on the internet. Have not found a website that answers my question. Not wikipedia or any other website.
I built a phase shift oscillator, but it
Won't work. I visit the website https://www.google.com/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/Phase-shift_oscillator&ved=2ahUKEwiV4Y-26OHiAhUClawKHQhACO8QFjANegQIChAG&usg=AOvVaw0YoHKumGz0Xl3fYKtIRdFa and copied the schematic I saw...
I am unable to get the wien bridge
Oscillator I built to work. This same
Circuit has worked several times. Sometimes the same circuit works.
Sometimes the same circuit does not work. When it works I can get
A led to blink and can build a frequency divider. How do I troubleshoot this circuit...
I have an operational amplifier. I am
Trying to make a comparator out of
It. I built a voltage divider to provide
Different voltages. But I either get
The same voltage output regardless
Of input or the voltage is too high I think. How do you make a comparator out of an operational amplifier?
I removed a condenser microphone
From a sound meter. I plug it in a breadboard. But the Condenser microphone won't produce a voltage or signal. I tried yelling into the microphone. I tried Connecting a battery to circuit. Nothing I tried worked. Anyway to get microphone to pick up signal?
Homework Statement
(a) With the aid of a sketch explain how proportional action is produced
in a pneumatic controller whose output is 0.2 to 1.0 bar. Assume that
the controller is direct acting.
(b) Show, mathematically, that the output is dependent on the difference
between the measured and...
Homework Statement
Prove the discreet signal is periodic:
Homework Equations
for periodic funtions: x[n] = x[n + N]
The Attempt at a Solution
I made an equality (im going to leave the sigma out for simplicity):
2^(-abs(n-2m)) = 2^(-abs(n+N-2m))
I dont know what I need to do from...
<Moderator's note: Moved from a homework forum.>
Calculate the required voltage to produce a electric arc between 2 iron nails (distance: 3cm).
I´ve read in the internet that you need 1 kV per mm. But how can I calculate this value, that I need 1kV per 1mm?
Homework Statement
Given the following circuit:
what is the positive and negative peak values of Vo?
vi has a frequency of 1kHz, peak of 5V, and is a sine wave.
Homework Equations
x(t) = Vsin(2(pi)*f*t)
KCL, KVL, etc.
The Attempt at a Solution
[/B]
I made Vi to be 5sin(2(pi)1000t)
during...
Homework Statement
FIGURE 1 shows a 50 Ω load being fed from two voltage sources via
their associated reactances. Determine the current i flowing in the load by:
(a) applying Thévenin’s theorem
(b) applying the superposition theorem
(c) by transforming the two voltage sources and their...
Homework Statement
I have the circuit given below with a single node where R3 and ground meet. How can I solve this problem using the inspection method? Is it possible? I can easily solve using another method but I would rather try using the inspection method.
Homework Equations
Ax = M
A is...
Homework Statement
In the circuit shown, in the image, the variable resistor R is consuming maximum power. Determine:
a) resistance for R
b) power for R
c) current for R3 and its direction
Homework Equations
The Attempt at a Solution
I tried getting IA(the direction is shown with arrows...
Hi. I am practising for my test and since I don't have the correct answers, I don't know if what I'm doing is right.
I tried to solve this problem, can you check it and correct if it's wrong?
Here's a clearer picture of the circuit.
I suspect Uab isn't right, but am not sure. Thanks...
Homework Statement
The op amp has a near ideal level 1 model with G = 5000V/V, ri = inf, ro = 0
How would I obtain the feedback function?
Homework Equations
I know I have to find the feedback function which is:
f = - (ΔV/Vin)
The Attempt at a Solution
I will first drive using the...
Homework Statement
The opAmp network shown in figure 68 is a transimpedance amplifer that employs both negative and positive feedback. Assuming that the op-amp is ideal, calculate the value for the output voltage for Jg is 1mA.
The circuit and question are this...
I am simply attempting to design a circuit in LTSpice. We just started on dependent sources.
I am having trouble designing this guy here:
Here's what I've got:
What does this error mean?
What do I need to change to make this circuit work?
I'm an upper division physics transfer student and currently deciding on whether I should take a course in numerical methods for physical modelling or basic into to analogue circuits course. Here are there descriptions:
math 174 - Floating point arithmetic, direct and iterative solution of...
I want to use small molecular - preferably CNT - "antennas" to produce THz signals to monitor activity in biological systems. After some googling, I've been reading things like "absorption spectra", "energy bands", "spectroscopy", as well as a bunch of antenna-science related jargon... I need...
Hello,
I've got a voltage comparator, well only on schematics, I need to chose one and I need some help interpreting datasheet. The datasheet I was looking at is of a lm393. My input voltage ranges from -7.8V to +7.8V. The datasheet says -0.3 to something. So it's not usable, right?
I was also...
Hello,
I am designing a circuit which basically takes two voltages (V1,V2) and based upon which one of the two is greater, turns corresponding LED. So, I have got to the part where I have output from differential op amp that is the input of the inverting voltage comparator with hysteresis...
Homework Statement
Hello,
I have got input from comparator op amp which gives HIGH or LOW. Based upon that, one of two LEDs needs to light up. Two LEDs should't be ON at the same time.
Calculations are not needed, only the schematics.
Homework Equations
None
The Attempt at a Solution
I am not...
Hi!
I'm about to take my senior year in high school, and I was originally planning on taking electrical engineering plus some extra classes in physics. I like to work with my hands and to create things, so engineering is sort of a no-brainer for me, but it's also very important for me to...