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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55 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
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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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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
42 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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0answers
25 views

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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8 views

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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0answers
19 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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0answers
58 views

Logic gates for an indicator light to show the state of three sensors [closed]

The farmer man uses three tanks to store certain volume of water that are required in a farming process, Each tank has a sensor that detects when the water level drops to %25 of full. The sensors ...
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1answer
23 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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1answer
62 views

Velocity of cart moving up incline with a motor [closed]

How do I calculate the velocity of a block moving up an incline of 20 degrees with a motor that has an output rpm of 1000rpm. The torque of the motor is 10g-cm max continuous torque I am using a 1 to ...
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2answers
68 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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Calculate rpm of a motor pulling mass up incline [duplicate]

I have a motor of 5000RPM pulling a mass of 150g up an incline of 15degrees. How do I calculate the new rpm of this motor please considering the load and incline?
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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
32 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
16 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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0answers
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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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0answers
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
63 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
36 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
30 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
317 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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0answers
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Is there a test network to analyze the hydrothermal (coordination of hydraulic and thermal generation units) dispatch of electrical energy? [closed]

I am developing my degree work on the coordination of hydraulic and thermal units in an energy network and I was wondering if there is any test network with which I can evaluate or compare the results ...
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0answers
44 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
65 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
44 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
24 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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0answers
19 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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0answers
19 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
47 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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0answers
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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
40 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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0answers
53 views

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
30 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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0answers
22 views

RLC circuit problem

After the switch is open for a long time, it is closed at t = 0. How can I find iL(t) and Vc(t) for t>=0? I tried step response for RLC circuit but I could not apply.
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1answer
26 views

How can I create an RL circuit?

I want to create a RL circuit that has a dc voltage source, lamp, switch, R and L elements are connected in series. How can I design the circuit so that the lamp flashes from the moment the switch is ...
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2answers
46 views

why we consider average current for dc while rms for ac in finding efficiency of half wave rectifier?

Efficiency= DC power output/Ac power input. DC power= I²(av.)*R. why average current? AC power= I²(RMS)*R. Why RMS current and not average this time?
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0answers
28 views

Evaluating bonding integrity of piezoceramic transducer

Currently I am working on a Structural Health Monitoring system utilizing piezoceramic transducers. The proof of concepts have worked very well. But we are in the process of working small scale ...
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1answer
47 views

Correct terminology for 'putting instructions onto an FPGA'

In an introduction to field-programmable gate arrays (FPGAs) Sparkfun describes that FPGAs aren't really 'programmed' (see below for excerpt) even though this is often used in every day language. If ...
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1answer
45 views

What meaning does the following sine wave have when it comes to amplitude?

So I am getting into engineering and was curious what it means when a sine wave isn't even in a sense, at 0, from my understanding, the waveform has peak to peak amplitude of 4, while having a ...
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0answers
23 views

Location of breakdowns in power transformers

Where exactly are breakdowns occuring in power transformers? Means, between which components exactly?
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4answers
2k views

Benefit of removing the center “engine hub” inside a fan

Most fans (small and large) have inner hubs (see image left). Would there be a gain in efficiency by removing that center hub, thus creating more blade space? You could fix the blades to an outer ring ...
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1answer
34 views

Simple EEPROM Code for Arduino to act as a Boolean

So I'm new to using Arduino's in general and just want to have my code by reversed each subsequent startup using the eeprom on my Arduino uno. I've been trying to read up on how to use the eeprom but ...
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1answer
43 views

Ethernet extender kit claims to send data through power cables - Is this correct?

I own an ethernet extender kit which has two devices connected to mains. Its data sheet claims that the device "your homes electrical wiring to extend your broadband network anywhere in the house&...
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1answer
54 views

How to make a stepper motor retract on power loss with arduino?

I am trying to make a stepper motor rotate a poster down (like a motorized projected screen) upon the Arduino receiving power, when the Arduino loses power for it to retract. The reasoning behind this ...
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1answer
55 views

Electrostatic wand to attract pet hair

Novice engineer here (primarily IT guy - I consider myself a jack of all trades, but go easy on me - I don't profess to be at the level of most of you.) I recently adopted a rescue dog, who is a real ...
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0answers
17 views

Can photolithography be used on a 3D object?

So normally, photolithography would be used to etch on a flat plane. I have a 3D object that I would like to have wires etched onto on 4 sides. Is there an adaptation of photolithography that allows ...

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