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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I2C (QUIIC/STEMMA) power source

I2C buses are frequently exposed via a 4-pin connector that carries ground, power, SDA, and SCL. The power is generally supposed to be 3.3V, but exceptions exist. Pinout examples include QUIIC, ...
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1answer
47 views

Investigating the potential of generating energy from moving water in pipes on a water production site

I work on a water production site, we have a staggering amount of water flowing, much of which is just using gravity pressure and feeding into reservoir tanks. (flow on various sites ranges from 100 ...
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Calculate the temperature stability of wavelength demultiplexer

Hi ive been given this question: A wavelength demultiplexer (DMUX) used in a DWDM communication system has a channel spacing of 100 GHz. The operating pass band of each channel is 50 GHz. The ...
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Power distribution problem in multi-camera usb array

Problem Summary My MacBook Pro (development system) can successfully capture images from 24 cameras in the multi camera assembly we have assembled. But when our assembly is attached to a new Raspberry ...
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1answer
14 views

Making a three phase squirrel cage induction motor in PLECS?

I was just curious if I was to make a Three phase squirrel cage induction motor connected to a mechanical load System Block Diagram in PLECS with a rated frequency of 60hz, 6 poles, 220V rated stator ...
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Three switches executing the same program for SCN5 Actuator

As indicated in How to reconfigure a control box unit for an SCN5 actuator question I want have 4 actuation programs as described below home, 100mm travel, home home, 75mm travel, home home, 50mm ...
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Is there an analogy between mechanical vibrations and electromagnetic waves

Recent questions about analogies between mechanical and electrical systems and about electromagnetic waves from a conductor made me wonder whether there is an analogy between the mechanical vibrations ...
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1answer
32 views

Peltier Module Set up isn't cooling

I have set up a peltier module with an aluminium heat sink, cooling fan, 12v, 7ah battery supply and thermal paste for the purpose of cooling water. At first, it performed well. It dropped down to 3.5°...
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How much energy do all the world's emails use?

I have heard high level statistics and headlines around blockchain uses more energy than the Netherlands I am interested to compare this quantitatively to other utilities, for example email and ...
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1answer
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Output pulse on rising edge

I'm new to electronics and I have a problem with timers and pulses. I have a 24 V input signal that turns on every now and then. On every rising edge of this signal (from 0 to 24 V), I want to output ...
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1answer
39 views

Can't tesla turbine work on air heated by solar concentration? [closed]

If we heat air along a pipe that's tilted at 30° to the horizontal using parabolic troughs, the air should rise upwards (I'm not sure how fast or powerfully) and then connect the outlet at the top ...
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1answer
51 views

Line to line voltage

I have a question regarding power electronics. What is the meaning of 'line to line voltage' what does it tell us and how can this be calculated. Say I have a three phase system how would one find the ...
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1answer
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Does P&ID have cross-reference same as electrical drawing?

In electrical i usually use cross-references to identify their symbols locations, I am still yet a lot to discover P&ID. So my question is, does P&ID have this such of thing?
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Large scale nonsymmetric standard and generalized eigenvalue problems in engineering

I apologize if this is not the right forum for my question, but I cannot think of better place to reach a large number of engineers within a short time span. Question: I am a mathematician working in ...
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56 views

Solder joints advice

Do you think these power distribution joints would suffice or should I improve on them?
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2answers
40 views

Can DC motors be used for regenerative braking only? [duplicate]

I am an engineering student working on a machine to tension steel wire rope for maritime uses. The wire rope (max, ~2000m, diameter 44mm) sits (without tension) on a spool (diameter 2m) and has to be ...
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1answer
57 views

How to reconfigure a control box unit for an SCN5 actuator

An image of the actuator is below. I have a setup that was given to me where there is two configurations, namely 50mm travel and back, and 75mm travel and back to home position. There are two switches ...
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2answers
84 views

When I try to spin my stepper motor faster then 1000 pps, it vibrates and doesn't move

Im trying to get my stepper to spin faster then 1000 pps, and my torque curve on my stepper's datasheet is showing it being capable of that(https://www.omc-stepperonline.com/download/17HS19-...
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1answer
32 views

What should I learn/study to start building ROVs (remotely operated underwater vehicles)?

I'm a software developer with no experience in building physical devices/hardware. I did ~15-20 beginner-to-medium-level projects with Arduino (following some tutorials), but I wouldn't count this as ...
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37 views

Z - transform of white noise

I am taking a graduate course in Digital signal processing with no prior knowledge in DSP. So I am struggling because I don't have the foundational knowledge. Please I need help with the following. ...
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1answer
52 views

Power Electronics Project

Can I use 220-12v,1.5 Amps Stepdown transformer along with 12V 2A (KBP200) bridge rectifier to build a charger for 12v, 7.5AH battery or I should use transformer with Higher output, maybe 15V
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Why using Tyristor (SCR) for inverting the DC voltage in HVDC systems?

In High Voltage 3 PHASE Transmission Systems the voltage needs to be rectified (from the AC generation source to DC), transmitted, and then inverted back (From DC to AC). For doing this, usually LCC (...
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How can you calculate the specific fan power of a fictitious HVAC system?

I am working on a concept involving an HVAC system drawing air in from outside. Known information: Air flow rate (calculated), change in pressure accross fan (given) and total efficiency (assumed). No ...
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23 views

Mecanum wheels begin to make robot spin around rather than move to the side

I am using mecanum wheels to steer my robot which I am programming using an arduino. The main problem that I am having is that whenever I attempt to make the robot move sideways like this: Instead ...
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1answer
33 views

Can I hook up pressurized hydrogen to a gas piston engine and have it work as is?

I am looking to try some type of hydrogen conversion to get better gas mileage but also want to work on something new to burn some extra time. I was mainly looking to see if I could power the entire ...
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2answers
70 views

What happens if an entire country turns off all lights and electric devices during peak consumption hours? [duplicate]

I've been reading about smart grids but I studied Computer Engineering and my already limited knowledge of power systems is very rusty. I keep hearing that traditional power stations have to adjust ...
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1answer
32 views

Can a level shifter convert power from 3.3v to 5v and then back to 3.3v?

I need a digital output from a raspberry to power a stepper driver that takes 5v as input. After that, the output from the stepper driver must be converted back to 3.3V because a Pi can't handle 5v on ...
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1answer
53 views

Raspberry pi, Stepper Motor and level shifter

It is my understanding that a Rasperry Pi cant handle 5V on the GND-pin. For that reason I got myself a level-shifter which is supposed to be able to change the output from 3.3V to 5V. I need it to be ...
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1answer
19 views

How to make a wireless modem using a normal Wi-Fi router and a 4g usb modem

I have a normal TP link (Model: TL-WR841N) router and an USB 4g modem. But the WIFI router does not have any USB port. I want to connect the USB modem with the router, want to share internet ...
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25 views

Smoothing caps/other methods to increase lifetime of incandescent segment displays (Looking for advice)

A while ago I salvaged a few incandescent seven segment from an old avionics module. This is the closest thing I could find online (I don't think its this exact model but same brand, pin number and ...
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Thermoelectric cooler parasitics

So I'm looking at performance curves for thermoelectric coolers, and it seems like these curves are so misleading as to be useless unless I'm missing something fundamental. Suppose I have a ...
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15 views

Methods for motion tracking without a gyroscope

I am doing a project involving motion tracking using an accelerometer. I know a lot of approaches for motion tracking also involve a gyroscope, but here there is only an accelerometer available. In ...
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1answer
30 views

What are the charge/power connector of restaurant order pagers / buzzers called?

They look like snap buttons and used for stacking pagers for charging. Closest things I can find are socket screws and cap nuts.
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1answer
75 views

Why are trams always electrified with DC, while trains can be electrified either with AC or DC?

Trains can be electrified either with DC voltage or with AC voltage. Various networks across various countries uses various standards. My question is however for trams, which are basically a lighter ...
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1answer
37 views

What is this object?

In framing the question, I can't be more specific as I have no idea (though a suspicion) about what this came from. I have a number of them that are several different diameters from 125mm to about ...
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1answer
31 views

How are components printed onto chips in lithography?

When making chips using lithographic techniques, How are the transistors and capacitors and other components "printed" onto the board? When we print one we use things like UV or E-beam to ...
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3answers
327 views

What is “per unit strain”?

When I read about stress analysis and specifically in the context of strain gauge, I often see the phrase resistance per unit strain or ...
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48 views

VFD or soft start to minimize power consumption on starting a motor?

I want to use the smallest generator possible to run a standard three-phase AC well pump. According to this website and others, it is advisable to use a generator capable of 3x the running kVA if the ...
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1answer
68 views

How to show gated sr latch isn't edge triggered?

How do I show this is clearly not edge triggered The truth table for this is as follows E R S Q notQ 0 0 0 prevQ prevnotQ 0 0 1 prevQ prevnotQ 0 1 0 prevQ prevnotQ 0 1 1 prevQ prevnotQ 1 0 0 ...
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2answers
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Why is there a 5V linear regulator on this USB ATTiny85 dev board?

This dev board. 78M05G regulator, attiny85 MCU. Similar (ON MC78Mx05) regulators' droupout voltage is listed at 2V0. USB voltage is specced at 5V0 (+0V25)(-0V55). The ATTiny85 can take 2V7 to 5V5, ...
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3answers
46 views

Liquid Level Control System Resistance

In the figure attached for reference, it is given that if $R_1$ is the resistance element of valve 1 and τ ∝ $R_1$, but I am not able to understand it intuitively. If $R_1$ is high, output flow ...
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1answer
25 views

explaining ohmic loss and understanding inverter efficiency curve

I'm trying to understand an efficiency curve from PVsyst, using this documentation However, I'm not sure what this sentence means: This production is penalized by an ohmic loss$^1$ of the internal ...
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1answer
28 views

Explanation for photovoltaic circuit

My background is in Environmental Science, although I have recently been taught in the basics for energy engineering especially for solar panels. I'm currently using PVsyst to build solar panels on a ...
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20 views

How to get my product IEC tested and certified

What is the procedure to get proper IEC certification for a product? What is cost of such action? I am talking about, let's say, a fan or an oven (if size and complexity of product makes any ...
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20 views

Solving single phase no load transformers questions

1000/100 V, 10kVA, single-phase transformers impedance referred to HV side given as (5+j10). The no-load power of the transformer is given as 300W. What is the efficiency of the transformer at full ...
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3answers
51 views

how can I control 2 stepper motors with RS-232?

Hello everyone this is my first post to the forum. I want to control 2 stepper motors using RS-232 as a way of directly communicating with step drivers from my desktop. I am new to communication ...
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Convert values of utilization category from AC7a / AC7b to AC5a / AC5b - Is it possible to estimate?

I have a contactor which is rated at 440V and 25 A for utilization category AC7a and 8.5 A for AC7b. Is it possible to give an estimate about the maximum current and power usage for appliances of ...
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1answer
43 views

Is this alternate grounding practice practically implementable?

While grounding power sockets in modular prefabricated steel buildings (see Light Gauge Steel Frame Technology), can we just connect the ground wire to the steel frame of the building itself? as the ...
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Effect of frequency resolution on the frequency spectrum of impulse force delivered by an electromagnetic shaker

this is a part of my parameter study for the experiment (a vibration analysis with a force impulse input). This specific part studies the frequency resolution effect on the spectrum. The input (i.e.: ...
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1answer
31 views

Phasor representation of RC circuit

I am struggling to understand how to take the KCL equation from time domain to Phasor domain. The time domain KCL equation is easy to understand and represented here: The phasor domain equation looks ...

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