Questions tagged [electrical-engineering]

Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.

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16 views

How to get an engineering job after a math PhD? [on hold]

I did my undergraduate in electrical engineering (power systems) in a foreign country. Now I am about to finish a math PhD from a low ranked school in the US. Even though I like math, I wished I had ...
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1answer
29 views

Controller vs Micro controller?

We often listen both term in electrical engineering? First one is seen in control systems course and second one in course of embedded systems But what is difference between both of these terms?...
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31 views

Engineer without physics? [on hold]

I tried understanding most of the concepts about electricity,thermodynamics,mechanics and most of them were easier to understand but the rest not so easy.Is that possible?I tried solving every problem ...
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18 views

light switch doesnt turn off lights [migrated]

I just recently installed a lightswitch. It's not a dimmer switch, so theres just an off and on. Now, the lights are constantly on! When I turn the lightswitch off, they dim slightly, and when I turn ...
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1answer
20 views

Power/energy density of an actuator

What is the meaning of power/energy density of an actuator? Context: As a novel kind of actuator, the dielectric elastomer ( DE ) demonstrates high-strain response [ 1 ] , high energy densities ( ...
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2answers
51 views

How do trolleybus switches work?

The switches are so high it's not possible to see how they function on the ground. I really tried to look up information about this on the internet, but there's very little info available, and the ...
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20 views

Is it possible to simulate the electric power output of a linear alternator using finite element analysis software?If yes, which?

We need to build a small (1-2W) linear alternator for a project in engineering school. Is it possible to use finite element software to finetune our design instead of actually building real life ...
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1answer
36 views

How exactly do noise canceling headphones work?

I purchased a pair of noise canceling headphones today and I was just wondering how exactly they are able to cancel out background noise?
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2answers
42 views

not sure how to use a signal from a sensor to make a lightbulb turn on or off

I am a very new student of engineering. I am in high school. The problem is my grandpa has an obsession with checking to see if the garage door is closed. So my dad is trying to get me to develop a ...
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1answer
22 views

How to estimate wind generation using power curve?

I am trying to verify windfarmer generation estimates manually. To do so I am trying to manually calculate the estimated energy production (kWh) of a wind turbine. The information I have available is ...
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0answers
9 views

Forward converter currrent flow

If we have the following forward converter: when $Q_1$ is on we have: Why is it that the Diodes $D_1$ and $D_3$ are off? Similarly when $Q_1$ is off why is Diode $D_2$ off?
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1answer
36 views

Get engine rpm using accelerometer

I'm studying the possibility to read an engine RPM by reading the vibrations of it. Basically an engine is "oscillating" on a car chassis on all 3 axes (X, Y, Z) but mostly on the Y one. When ignition ...
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2answers
22 views

How does ferranti effect occur?

I search and read about Ferranti effect online, but none seems to be clear enough for me to understand how it actually happens. I must say, I do not have much prior knowledge about inductive/...
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3answers
99 views

Relative inefficiency of doorless fridges at supermarkets

It appears to be a waste of electricity to keep a bank of refrigerators wide open with no doors or covers whatsoever on them. They seem to be just blowing cold air out into the supermarket. They ...
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1answer
56 views

How do I determine the temperature inside a transformer vault?

I am trying to determine the temperature of an underground concrete vault buried 10m underground. The vault has the following dimensions: 2640mm x 5995mm x 2640mm with a wall thickness of 250mm. The ...
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1answer
90 views

Why does collector current increase with base current in BJT?

The base current in the BJT is due to the recombination of holes and electrons. To neutralize the p region an electron leaves the p region. If we take it the other way round, the larger the base ...
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1answer
36 views

How much aluminum does a HV, MV or LV transmission line use?

I have accurate statistics about the total length of high-voltage (110-400 kV), medium-voltage (1-70 kV) and low-voltage (0-1 kV) transmission lines in my country, and they are: High-voltage: 22 500 ...
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22 views

How would I go about charging titanium dioxide for e-paper technology project?

I'm experimenting with rubbing a balloon on a silk (to get the electrons) and then touching the balloon to two small aluminium foil balls to see if they'll repel but they don't (if I do it with ...
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1answer
30 views

Why is the tv playing if the carrier frequencies in our RF project appear unsupported?

My group made an RCA video/audio to RF modulator for a school project. The video is a NTSC composite video signal. Here is a clip of our tv receiving the output of the project on NTSC channel 2: ...
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1answer
104 views

Why/when is AC-DC-AC conversion superior to direct AC-AC conversion?

I am currently studying wind power and the power electronics used for it. In wind power a generator is driven by wind, thus the resulting power is of widely varying frequency and amplitude. The power ...
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0answers
21 views

Is it possible to calculate torque using strain gauges on a rotating shaft?

I am currently designing a torque sensor and am looking into the ability to use strain gauges as a instrument to measure strain and calculate torque. The current setup is two motors connected via a ...
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34 views

Can e-paper capsules be made larger in size?

Can I buy individual (larger in size) e-paper capsules from somewhere? (for an electronics project for example) and is it even possible for such large e-paper capsules to be engineered?
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22 views

DC motor Magnetic axis of armature winding vs EMF

When considering the cross section of a DC motor we have: I notice that the Magnetic axis of the armature winding is aligned with direction of the EMF that will cause the rotation. Is there a ...
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0answers
25 views

Health hazards of disassembling electronic devices?

I´ve been disassembling a lot of electronic devices in order to recycle them, separating plastics, electronic boards and bolts/other metal parts. Is there any proof of health hazards for doing it ...
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0answers
19 views

Mobile Frequency and Carrier Frequency not Matching

I am using a Google Nexus 6 Mobile in India with Airtel as Network Provider. Recently Airtel has upgraded their Network to 2300 Mhz 4G. Whereas Google Nexus 6 Operates on Band 3 (1800Mhz) LTE. When ...
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2answers
34 views

Induction heating rebar in cold weather

An induction cooktop has a high frequency power source that is applied to a coil. I was wondering if you could take the high frequency electronics from a cooktop or even buy / design a high frequency ...
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0answers
32 views

Can I use a single stator coil to actuate/rotate two rotors inside and outside of the stator

I want to design a motor system where a single stator coil is responsible for two rotors of neodymium magnets on its outside and inside, will this work, and what are the downsides I should be ...
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21 views

How to detect milk spillage or milk boil?

In my country we generally boil milk before we drink. Often the milk heats up and spills from the pot. I want to detect milk boil before it spills off.I am thinking of a thermal camera solution that ...
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0answers
34 views

What kind of professional(s) build/design factories? [closed]

I have a small self-built food processing unit (500sqft) but it is very labor-intensive. I want to make a larger unit (45,000sqft) with 100x more output using factory machinery (automation, conveyor ...
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1answer
32 views

What is the type of this connector?

Can someone tell me what the type of connector is??
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0answers
17 views

Generally speaking are inrunner motors better generators than outrunner motors or vice versa?

Using a motor as a generator but looking to test something I understand that outrunners have a higher torque but would that be neccesarily good for generating electricity or not?
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1answer
65 views

Changing fields from mathematics to control engineering [closed]

I did my undergraduate in maths and physics and will be working in control theory for my future job. Not to my surprise, my engineering background is rather lacking. I have taken a look at materials ...
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1answer
37 views

How do i measure the time taken for a laser to cut a metal?

I am a placement student and was given a project asking to measure the time taken for the laser to cut a metal and send it to Excel into a spreadsheet automatically. I am a computer science student ...
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2answers
38 views

Persistent Bistate Toggle Switch

I'm a noob if it comes to electronic components but I'm trying to achieve the following and I would really appreciate some suggestions: I have the following requirement: When a circuit is closed the ...
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0answers
36 views

Deciding between Electric or Hydraulic Actuators for a Dynamic Load of around 4 kN to 6 kN

This is a project regarding linear actuators for a 4 Wheeled Robot, with spider like hinged legs. The first question on my mind was to figure out is if a hydraulic system has any weight to Force(...
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1answer
27 views

How can I transmit signals from pre-amplifiers to a laptop nearby using bluetooth?

I am trying to collect signals from preamplifiers (Aquarian Audio preamps, PA-4) and have them sent to a laptop nearby wirelessly, I have not found a dedicated device for this process, and the ...
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1answer
38 views

How effective are pancake motors as generators and why

Using a motor as a generator but looking to test something Why would or would they not be good generators thanks
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45 views

Negative transmit power in dBM

I am calculating the transmit power for $K$ single antenna IoT devices in an Indoor scenario. The receiver has 64 antennas. I am trying to minimize the transmit sum-power, i.e., $\sum_k p_k$, where $...
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21 views

Static charge, PVC pipe and water

I know it's possible for a PVC pipe to develop a staic charge due to fluids flowing through them. This is a twist on that idea. Can a sealed length of pvc (say 3.5 feet in length) - tethered below ...
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0answers
19 views

Are there any books which show how to design electrical coil heat exchangers?

I need to design an electrically powered gas heater, but i need to do so in detail. I'm looking for a guide similar to the shell and tube heat exchanger design guide in coulson and richardson's ...
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3answers
84 views

Cheap electrical motor that can spin freely in both directions when unpowered

I am looking for a cheap (preferably under 2000 USD) electrical motor that can spin freely in either direction when the motor is unpowered. The motor will be used as an alternative source of power to ...
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1answer
38 views

LPF Second Order use cascade

What is the minimum value of $R_2$ (in $R_1$) to minimize loading effect? Please explain the concept.
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2answers
39 views

Integrator OpAmp

Tell me how can the 's' in first equation described with the 'integration' in second equation?
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1answer
48 views

Operational Amplifier

In this case, can I say that $V_E$ correspond to -0.7? if yes, why can this be?
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0answers
21 views

Tundish Lift Lower mechanism

I have two no of motors connected in parallel of 7.5 kw max current capacity 30Amps. The load is about 18Ton is the motor sufficient to lift this load. The mechanical arrangement of screw jack system. ...
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0answers
33 views

Starting of direct current Motor

what happens if starting arm of starter does not return to "OFF" position after a temporary supply failure?
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0answers
36 views

RMS value of fundamental component

I need help calculating the RMS value of the fundamental component of source current. The electrical circuit is a fully controlled single phase rectifier bridge. In the lecture the value is $$I_{RMS}\...
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3answers
61 views

What kind of plug is this?

Can anyone help me to identify this electrical connector set? Hint: One male plug style connector has some text saying "HC 0617 CANNON"
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1answer
45 views

How to design and make thermal inkjet print head / nozzles

I'm recently interested in print-heads, especially thermal inkjet print heads. I would like to design a simple print head with nozzles in a row with no chambers, but only a straight linear pipe-like ...
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2answers
42 views

What's the difference between pulsed lasers and frequency combs?

Can you please explain the difference between high-energy pulsed lasers and frequency combs?