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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22 views

Do all thermoelectric generators (TEG) require two distinct metals?

Most thermocouples that I've seen being sold online consist of two separate metal wires connected at junctions. Many smaller thermoelectric generators consist of a combination of iron and copper or ...
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19 views

IP2, IP4 relationship with P1 dB of an amplifier

It is well known that the difference between IP3 and P1 dB of an amplifier can be derived and results in a theoretical 9.6 dB difference. Can a similar relationship be derived for IP2 and IP4?
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62 views

Dynamic model of a two-mass electric drive taking into account the Gear Ratio

Two-mass rotational system has the following form and is represented in following structural diagram. where $\tau_e$, $\omega_1$ and $J_m$ - motor torque, angular velocity and moment of inertia $\...
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39 views

Can a semi-conductor cooler be powerful enough for a room? [duplicate]

I see semiconductors used for small fridges. I cannot find one large enough to cool a room (in place of a conventional Freon based, window air-conditioner). What engineering problems might a up scaled ...
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1answer
48 views

Electrostatic grounding of an electrically isolated concrete floor

I have a question regarding a not-so-common construction setup for a house. In this situation, the concrete slab is "floating"/insulated with a rigid insulation underneath. I understand the ...
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39 views

ArduinoArduino keypad matrix w/ SPDT

I'm trying to create a keypad matrix with an Arduino. I want do a 5x5 grid but I've run into a problem. I'm using standard momentary SPST push buttons and 2 position SPDT toggle switches (On/Off) ...
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1answer
37 views

Electrical Engineering/Telecommunications/Power Amplifiers VSWR and harmonics

How does VSWR at a power amplifier output affect the level of harmonics? and is there any textbook or paper which addresses this issue?
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2answers
52 views

Demodulation of AM signals in radio broadcast systems

I have a question regarding the demodulation of AM signals in radio systems (like car radio). I know that in order to send the audio signal from the broadcasting station to users we need first to AM ...
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34 views

Jacobians and Manipulator Dynamics

This is a Stanford Manipulator I started off working on it by initially setting up the DH table Transformation Matrix and then Homogeneous Transformation Matrix I started finding the linear and ...
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1answer
51 views

What does "rigid steel" mean in electrical construction plans and specs

Reference to rigid steel is made in specs with reference to metal conduit. A commenter wanted to add 316 stainless steel as the material but this verbiage with regards to "rigid steel" still ...
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21 views

What are the IEC IP standards/code for electric vehicles?

What an end consumer should know about the level of IP protection provided for a vehicle against hazards which include but not limited to environmental factors, thermal runaway in batteries, etc.
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85 views

How do I configure my arduino to use the 628512LP-70 as an external RAM?

I am aware this could cause some serious lag issues. However, I only intend to use that RAM to fill the display buffer for the LCD (240 * 320 pixels). I can't store all of this data in my Arduino's ...
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1answer
65 views

What type of electrical machine component for counting time?

I am looking for the proper piece of hardware to do what I'm looking for on my current prototype machine build. I want a timer to begin counting upwards in seconds when a switch is activated, and ...
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32 views

Device to measure 3-phase electrical power consumption

For a three phase air-conditioner, what is the easiest way to measure the power consumption? Is there any off-the-shelf device that can get the job done and output the measurements through RS485 (...
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74 views

Cost effective electronic packaging solution

What would be a cost effective environmentally friendly material to package a simple electronic circuit? The electronic circuit consist of active and passive devices. These electronic circuit also ...
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2answers
73 views

How to drive variable power (up to 1500w) to a grill heating element [closed]

I have a heating element like the following: which is rated to 1500W. I need to be able to drive up to 1500W of power to it, but potentially less. I will be plugging it into a 120V wall outlet. I am ...
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18 views

Control Partitioning in presence of external disturbance force

I am simulating the dynamics of a control system that has been designed using the control partitioning technique (model-based control + servo control). I am having a query for the case when an ...
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21 views

Find same modulus z plane poles of over damped system

I am asked to find two poles of a second order discrete over damped system that have the same magnitude (0.4, to be exact) in the Z plane. From what I understand, that is not possible since over ...
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1answer
255 views

Right justified and left justified mode I2S [closed]

How can we check the Audio codec (wm8960) is in right or left justified mode using raspberry-pi I connected wm8960 audio codec to the raspberry pi and i recorded wav file i checked in the dmesg its ...
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1answer
81 views

Why does my trimmer feels heavier when it is operating and its fully charged?

I have a Philips trimmer which when fully charged feels much heavier than when it is not charged. Also , the blades move much faster when it is fully charged I.e it’s weight , speed of blades kind of ...
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1answer
156 views

Does electricity go through non-metal materials or not?

Ever since I was a little boy, I've always had this idea that electricity can only go through metal materials. For example, if I put a 100% metal screwdriver into the socket in the wall, I'm going to ...
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1answer
103 views

How much water do steam turbines consume per kWh of electricity generated?

I know this depends on some factors, and I can only think of these: the inlet steam's temperature and pressure. If there are more factors then please do tell me. What is the maximum figure in liters ...
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27 views

How to switch between two cores (inside the coil) in a simple brushed DC

I am going to build a very simple brushed DC motor. The rotor will not be enclosed in a stator (the rotor will be built on a bench with free space around it), and I will using permanent magnets to ...
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2answers
401 views

Why are both conductors in a High Voltage Direct Curent powerline isolated from ground?

Picture of a High Voltage Direct Curent powerline (HVDC line) on the Læsø Island, Denmark (from Google Street View): We can observe that there are 2 conductor cables, and that both are insulated from ...
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1answer
39 views

Finding Thevenin Equivalent Voltage

What I did was I found the $I_{short circuit(AB)}$ = 10/5 = 2A by shorting AB. How am I supposed to find $R_{AB}$ in order to solve for $V_{Thevenin}$? It can't be 5//10 right?
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87 views

Why doesn't the European Type F plugs use a regular earth pin?

Plugs and sockets tend to differ between countries. Though many different standards exist the vast majority have one thing in common: The pins (earth included) are attached to the plug. However this ...
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1answer
41 views

USB sound on PC when plugging laptop charger into the socket [closed]

Sometimes I hear my PC making the USB - connected device sound when I plug in my laptop charger into the socket. By USB connected device I mean the sound that it usually makes when I connect something ...
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1answer
31 views

Use magnetic levitation to lift a carousel capable of turning 9000lbs [closed]

Allow me to describe my current situation. I have a 18 ft (5.486 m) carousel that is assembled using steel beams that are bent into two circles, an outer and an inner. And there are steel spokes ...
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0answers
20 views

Transforming a Wireless Computer Mouse into a Wireless Switch [closed]

With no computer involved whatsoever, I want to be able to read oscillator outputs from my wireless mouse and switch an LED on a left click AND off on a right click. I have taken my mouse apart to try ...
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1answer
29 views

Safely Measuring Voltage from Solar Panels in an Experimental Research Field

I'm installing solar panels (not connected to the grid) in units out in a field for research we're doing that looks like this (this is an outdated image, but I can't find the updated one unfortunately)...
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1answer
36 views

What is basic knowledge wanted from a bachelor mechanical engineering student before joining? [closed]

At the moment, I just finished my senior school year and in a few months, I will be studying mechanical engineering as bachelor degree. However, I don’t like to waste my time and want to use this time ...
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1answer
31 views

Explanation on negative voltage to microcontroller

How does negative voltage damage the pins of my PIC16877A microcontroller. Could anyone explain to me? Thanks
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28 views

I2C (QUIIC/STEMMA) power source from microcontroller output pin

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
55 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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19 views

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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20 views

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
31 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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26 views

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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50 views

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
51 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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30 views

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
30 views

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
44 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
73 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
54 views

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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50 views

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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2answers
77 views

Solder joints advice

Do you think these power distribution joints would suffice or should I improve on them?
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2answers
46 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
73 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
88 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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