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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Inductive charging coils

I've been working on a project that requires some wireless charging, at about a 10mm gap. I've found some inductive charging coils on the Adafruit website (part number 1407), but I, unfortunately, don'...
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How to control a Stepper Motor with CircuitPython?

So I am using a Seeeduino XIAO as my microcontroller which then connects to a ULN2003 board connected to a 28byj48 Stepper Motor. I have wired the Digital I/O pins from the XIAO as D1 -> In1 D2 -&...
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What is GPS and TR in EMTP RV?

I Want to simulate following system in EMTP RV but i dont have any idea what is GPS and TR(transiet recorder)
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Industrial (Farming) high precision gps tracking solution [closed]

Context: I am a hobbyist and I don't have experience with industrial solutions I am starting to prototype a farming equipment gps guiding system and I was looking fore some feedback regarding my ...
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What are the biggest engineering challenges in non invasive blood glucose monitoring via nuclear magnetic resonance? [closed]

NMR seems like a promising technology for non invasive blood glucose monitoring. What are the biggest engineering constraints around doing something like this? Magnet size or weight? Inaccurate ...
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How feasible is it to build a benchtop semiconductor protoyping fabrication set up?

This is generally quite a vague question as I'm new to the space but I've been thinking a lot about 1 off prototyping in the IC/semiconductor space and have been wondering about the feasibility of ...
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How to find pixel density in LED Display Board?

How to find pixel density in LED Display Board? How do we compare pixel per inch and dots per inch? In this example, a screen of 16'x9' is shown. How did they calculate 4875x2710P and 975x548p and so ...
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Heat transfer: does the heat generated in a cable get transferred to the electrical components?

I have a 1000 V, 50 sq mm, double insulated (XLPE) copper conductor cable. This cable is being connected to a power electronic component. The current flowing through it is 230 Amps DC. The cable ...
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How to send a TTL trigger signal remotely

Sorry if this is a dumb question, but I am an undergrad intern working on a semi-independent project in a lab, and no one here can really help me with this. I am trying to control a lab instrument ...
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Why do identical-looking power plugs randomly not fit in some sockets in the same power strip?

This has bothered me for many years, but I'm only now coming around to ask about it. I don't know if this is unique to Sweden or something, but for whatever reason, when I try to plug things into the ...
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Why am I getting such conflicting safety advice regarding opening up and dedusting/servicing my CRT TV?

I have asked questions on Stack Exchange. I have watched many videos on YouTube. I have asked professional TV repairmen. I get wildly different advice on the safety of opening my 1989 28" CRT TV. ...
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How to split power from a single DC source?

Basically I would like to power a Seeeduino Xiao (basically an Arduino board that accepts 3.3V) and a 28BYJ-48 stepper motor via a ULN2003 Board (which accepts 5V). I was thinking of using a single 9V ...
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Why is the sum of a full adder a 3 input XOR?

The S (sum) output of a full adder is made of a XOR gate. But with a XOR gate, the last row of the truth table wouldn't be true. Just wondering what I'm not understanding here.
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Could large electromagnets be used to stop active shooters? [closed]

I was thinking that a powerful set of electromagnets in high risk doorways could be used to stop active shooters. By placing them in doorways. The magnet size could be mitigated. Also, they could be ...
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Solar Micro-inverter: Energy Destination

I have just started looking at the concept of solar panels with individual micro-inverters. Let’s say we have a simple setup of a single solar panel with its own micro-inverter that synchronizes with ...
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2 answers
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How do I program a mass flow controller?

I need help to program a gas mass flow controller used to let out a proportionate amount of gas. If I were to pump 3 gases into the controller. I need to be able to let out a specific amount of the ...
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How to slow down an electric motor for pull cart?

I'm trying to retrofit an electric motor (such as this) to a pull cart as depicted below. I got most things figured out except for how to slow down the motor to a pedestrian speed. Could I slow it ...
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Does an iPhone on airplane mode continue to emit electromagnetic radiation field?

I've been told that it does because it's still searching for networks or something, which doesn't really make any sense to me. But what does fit somewhat with that are notices in the android interface ...
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What is the best way to enhance an existing LTE signal on a mountain hut?

I'm traveling to a mountain hut in Austria every year which is in the middle of nowhere. If you're lucky you can sometimes get one bar and a weak Long-Term Evolution (LTE) or Edge connection for a few ...
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Will the cart steer to the left/right by itself in this design?

I'm trying to retrofit a pull cart with electric motor. So, one wheel will have an electric hub motor and it is connected to a rotating shaft to the other non-powered wheel. The driveshaft is ...
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Basic questions about power grid stability with variable loads and sources

I am curious about integration of renewable energy in electricity grids. I am a mechanical engineer and understand energy and power but I have little knowledge about electricity. I will be thankful if ...
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Could radial bearings with brackets hold the weight and load of a large cart

Me and my partner are trying to build electric pull carts to assist elderly Korean women and men who collect paper boxes for a living. These boxes are sold for recycling. They work virtually at every ...
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Combining lower & higher rated solar panels

I have a set of 6 panels 75W each @ 19.1V | 3.92A Another set of 4 panels 435W each @ 44V | 9.87A Now how to add these such as to optimize Watts to maximum? Plz see the attached calculations. Am i ...
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Can the Dynosheet be read as a Fourier transform of some sorts?

I've done some quick google search on dynosheet, and what it does is that it measures the power output of the car with respect to its frequency. My initial understanding of the dynosheet is that it ...
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Is there any way to relate the induced EMF from an alternator to the DC current that is used in the field winding?

I'm trying to simulate the open circuit saturation of an alternator. Basically, by changing the amount of current that is going through the field windings (rotor), the voltage induced in the armature ...
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1 vote
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In a AWD Tesla Model 3, why is the front and back motor different?

In a AWD Tesla Model 3, why is the front motor (OEM 1120960-00-E) different from the one in the back (OEM 1120980)? Why not just use the same one for both front and back? I'm sure that there was a ...
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What's the minimum torque needed for 2 DC motors for moving a 1 kg object on top of them?

I have a weight of 1 kg and I want to properly choose 2 DC motors for them in order to be able to move the 1 kg of weight with variable speeds in the range of 0 to 1 m/s with an increment of 0.05 m/s. ...
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2 votes
1 answer
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How friction between stator and rotor is dealt with in an electric engine/motor

This YouTube video https://www.youtube.com/watch?v=nlG2dsYRagI shows how an electric engine is made but I don't understand how friction between the stator and rotor is dealt with. At 3:50, we see the ...
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What are some methods of converting electricity without the use of induction or heat?

I was trying to study exactly how current in a wire is used to do so much in our life and how the energy is converted. But the only methods I have found are by using the resistance of the conductor to ...
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Why are two wires used in railway overhead equipment?

While watching the train videos, I came across these overhead wires. After searching on the internet, I found that both catenary and contact wires carry the same voltage and are connected by vertical ...
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Find the values of resistance R and inductance L in the R-L-C circuit

I'm not really sure how is the current, represented, usually it was represented as the positive OX axis and the voltage (potential difference) was between -90 and 90. Is the current -35 below the ...
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How do 120V AC dimmable LED bulbs advertised as "flicker free" work?

I'm a layperson, not an engineer, so forgive the ignorance. I want to replace some dimmable 120V AC G8 xenon bulbs with LED bulbs, but so far three different LED bulbs I've tried, all advertised as &...
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Differences between satellite dishes and Hertzian antennas

I have a text of notes for the electronics and telecommunication course, there is a section that talks about both the parabolic reflector antennas and the Hertzian antennas, in a test a question asked ...
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1 answer
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Would the below thermal generator work properly and provide surplus energy?

Since thermoelectric generators make electricity through thermal flux, could a device that mixes NaOH and HCl on one side (heat) and Ba(OH)2•8H2O and NH4SCN (cold) be efficient? Could it produce more ...
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Faraday's law applied to a coil in an electromagnetic field

According to Faraday's law, we have the law: where "e" is the electromotive force which is equal to the derivative of the phase of the vector "b" through the surface s of the loop ...
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Inductor Voltage at t=0

In the circuit below, the switch has been in position 1 indefinitely long and suddenly switches to position 2 at t=0. I'm asked to find the initial voltage of the inductor at t=0. My professor lists ...
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Reason behind very high electrical potential in contacts in ANSYS APDL?

I am running a couple field analysis (electro-thermal) on a PCB. I want to know, what could be the reason behind very high electric potential in the contacts and target elements? In the parts of a ...
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3 answers
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Measurement of actual carbon dioxide mass emitted from a diesel engine

I am looking for a solution to measure the actual total mass of carbon dioxide (CO2) emitted from a diesel engine used for power generation. Infrared CO2 sensors generally measure the gas ...
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Is half of depletion region a part of N region or P region?

Is it correct to say that if the P-N junction is in the middle of the depletion region, half of the depletion region is for the P region and the other half is for the N region?
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Nodes in a summing amplifier circuit

In the derivation for the gain of a summing amplifier, I have labelled nodes 1 and 2 as being 2 separate nodes. Is this correct? or do points 1 and 2 count as 1 overall node? (Points 1 and 2 are the ...
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What can be done to increase the accuracy of an op amps gain?

When working with op-amp circuits such as non-inverting, inverting, and summing amplifiers there is always some discrepancy between theoretical and experimental gain. I know a cause of this can be due ...
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What is this component on the face of an analog clock?

I have this decade old wall clock in my house and it has this little component peeping out its dial. I was curious as to what this component is and what it does in a clock. I was into Arduino for a ...
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I'm getting an Incorrect Plot for a Diode Curve

I am trying to build the following simple diode curve tracer: Here are the parameters of the setup: R1=R2= 1kΩ R3=R4= 5kΩ Vfg: F= 100Hz VPP = 16 Opamp 1 &2 = UA741 DUT = 1N4007 *Oscilloscope = ...
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Calculate the field efficiency factor for two long wires?

how can we Calculate the field efficiency factor for two long wires? field efficiency factor>>>>>>Eh=U/d>>>>>>η=Eh/Emax but i dont know how to Calculate the field ...
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3 votes
1 answer
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High Fan Speed Not Cooling As Expected (PWM, Arduino)

We have a system involving a fan blowing air through a box which contains a small (but constant) heat source and a temperature sensor. The fan speed is controlled with PWM. As PWM (and hence fan speed)...
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Manual/Electrically controlled loaded spring release for door kick-down stopper

Hoping to upgrade this or similar telescopic door kick-down stopper to release the stopper remotely. Wondering if there are standard solutions that would allow for electrical and manual loaded spring ...
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Working of gearbox in driving simulators

I am a newbie in this field. Please help me in gaining a bit initial fundamental knowledge in simple language. How are gearbox ratios interpreted in driving simulators? Are the gearboxes used in ...
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If I build an efficient electric motor, will I have built an efficient electric generator/alternator?

Because I found a design for a ~80% efficient 3D printable motor, but I would like to use it as a generator from a wind turbine as well.
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1 answer
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Path length of a satellite signal

I am trying to work out the length of the Rsv, but I dont understand how to go about this. If the length R is known and the angle EL is known how do I go about solving for this length. I was given ...
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ecg cable is there any different from brand to another

i have this device but ecg 3 lead cable is missing my question can i use different brand ecg cable for this device the second picture plug I have the last picture is missing can i use different ...
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