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Questions tagged [conductivity]

Electrical conductivity or specific conductance is the reciprocal of electrical resistivity

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Why does a line-tester glow more when I touch the steel door frame?

I reassembled my line tester, and it was then that I got to know how it actually works. I know that when someone touches the metal part at the top, the neon LED inside glows. However, I have seen that ...
Awais Saeed's user avatar
2 votes
1 answer
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Optimal thin absorber of electromagnetic energy

I am a material engineer and have a question about a formula derivation regarding microwave absorption properties. I really cannot figure it out after days of trying. This should be simple for a ...
temperature's user avatar
5 votes
4 answers
752 views

Thermal conductivity of 1600W/m·K?

I am comparing different thermal conductivities in the market and found that the thermal conductivity goes up to 1600W/m·K for a thermal sheet, but a thermal paste is still 0.65 W/m·K. Does it make a ...
Mhairi's user avatar
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2 answers
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Modifying a TDS Module for Higher Electrical Conductivity Measurements

I recently acquired a Keyestudio V1.0 TDS module, primarily used for measuring the electrical conductivity of water. The module is recommended for 0-1000ppm or 0-2000μS/cm measurements. However, my ...
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Right-angle traces vs curvilinear traces in a PCB

In a PCB, what is the advantage of using curvilinear copper traces compared to right-angle traces? Can there be a difference in heat dissipation in a right-angle trace that has 270° of free space at ...
boromyr's user avatar
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4 votes
2 answers
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What does mΩ/sq/25 μm mean?

I came across this specification on Saralon.com where they mentioned for one of their products "Stretchable silver ink for stretchable electrical connections. Specially designed for bending ...
Swarup's user avatar
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3 answers
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How does an analog metal rod stop a water pump by touching water?

I’m currently building a steamer (like on an espresso machine) and the part that tells the water pump to stop sending water in the boiler is a simple rod of metal inserted in the actual boiler. Now, I’...
bernard leclerc's user avatar
1 vote
2 answers
118 views

How electrical current works in intrinsic semi-conductors

I understand that there are two types of currents going on when voltage source is applied in pure semi-conductor material - electron current and hole current. What I'm trying to do is imagine it.. So ...
同等の構成's user avatar
1 vote
3 answers
153 views

Moving electrons on the surface of a thin metal sheet with high current

I don't know if this is the right place to ask this because my question is a mix of physics and electronics. I'm in 12 grade, and wish to conduct a simple physics experiment. I would like to observe ...
44yu5h's user avatar
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13 votes
10 answers
4k views

Freely rotating part that conducts electricity to fixed part - does this exist?

Planning a design that has a 12V voltage source connected to a physical part that rotates. I need to conduct electricity from the rotating part to a fixed part which is connected (electrically ...
formerlolz's user avatar
1 vote
3 answers
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Attaching terminal lugs to conductive case

I am wondering if there is a standard way to attach terminal lugs to a case that is conductive. I want to create an electrical connection that is mechanically connected with a screw. The issues with ...
mm3psych0sis's user avatar
5 votes
2 answers
391 views

Low electrical resistance, high thermal resistance conductors

I was thinking about diamonds, and how they're excellent thermal conductors and yet at the same time very good electrical insulators. Does the opposite of diamond exist, i.e. are there commonly ...
Kenn Sebesta's user avatar
0 votes
6 answers
254 views

If there are two electrical conductors in a circuit with differing electrical conductivities will electricity choose the most conductive conductor?

Say you had two parallel wires, one copper and one steel, copper having a much higher conductivity than the steel, will electricity choose to flow through the copper wire, ignoring the steel wire?
August H's user avatar
2 votes
1 answer
215 views

How good of a conductor is laser-induced graphene from Kapton tape (polyimide)?

I had intentions of making a DC electromagnet using laser-induced graphene (LIG), where the graphene will be used as a flexible electromagnetic coil. Something like those 24V electromagnets you can ...
Fulano's user avatar
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1 vote
2 answers
139 views

What are the practical differences between solder balls and spherical tin powder?

Solder balls are made of tin, with small amounts of silver and copper. The minimum size of solder balls is limited. Nano spherical tin powder is available in smaller particle sizes. If such a tin ...
EddieP's user avatar
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1 vote
2 answers
319 views

Best grade of graphite powder for a conductive paste

I want to make a conductive paste using graphite powder mixed with a liquid binder. The idea is to create heat through Joule heating when the (alternating) current is passed through the graphite, so I ...
EddieP's user avatar
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1 answer
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Why aren't stranded wires used more widely if conductivity is improved and price is reduced?

Why aren't stranded copper coated aluminum cables (CCA) widely used outside a small niche of speaker wires or 12 VDC applications? According to this post the issue is with the insulation jacket which ...
estinamir's user avatar
0 votes
1 answer
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Highly thermo-conductive epoxies for potting

Some advertise as much as 2 W/mK of thermal conductivity. Free air is no more than 0.03 W/mK at usual temperatures. Air convection I think will be the same in both the potted and unpotted cases. Does ...
kellogs's user avatar
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3 votes
2 answers
217 views

How to coat a thin electrical wire with carbon?

I am looking for glue that can be used under a bio-solution. The solution is a bacteria culture solution (LB, SB). I have a chamber filled with culture solution and I would like to extend an ...
Anwer Ak's user avatar
1 vote
1 answer
204 views

How to correct PWM signal

I am trying to design something to test the electrical conductivity (EC) of water. Knowing that conductivity is the inverse of resistivity, my plan was to measure the resistance of the water via a ...
MCG's user avatar
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3 answers
379 views

Saltwater Measurement via Arduino

This is a strange question, but I'm trying to learn specific uses for all of the Arduino functionalities. If I were to program the Arduino to spit back the result of analog input into serial as seen ...
sprx2's user avatar
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2 votes
3 answers
190 views

Is there any difference between electricity flowing in earth vs. flowing in wires?

I wonder how the earth (real earth, not earth wire) works as a conductor in Single Wire Earth Return system, or in case of a fault in regular grounded systems. How far can electricity flow in earth, ...
George Lee's user avatar
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0 answers
69 views

Do antennas still radiate in a conductive medium?

Since normal antennas are placed in air or a vacuum, I was wondering what it would take to get an antenna to work underwater, especially in something conductive like seawater. What would be the ...
N. Berg's user avatar
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2 answers
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Minimum resistance of copper regardless of thickness

In a system where you have an unlimited amount of copper, is there a minimum or floor to the resistance? Scenario would be a wire 24000 miles long, attempting to keep the overall resistance below 1 ...
Passerby's user avatar
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2 votes
0 answers
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Why my wooden table and mouse pad on it measures 12 volt?

I have a non-contact type AC/DC tester which can test 12V - 250V AC and DC. When I put that on my computer table, it shows a 12V reading: The tester that I have has no battery inside. So there must ...
15 Volts's user avatar
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1 vote
2 answers
476 views

Why can't conductors be used in making ICs (integrated circuits) instead of semiconductors? [closed]

I really wanted to ask why we can not control flow of electrons in conductors. Can I not say if a current is flowing in a conductor it is 1 and when I disconnect the supply it is 0. Can you elaborate ...
PARUL's user avatar
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2 votes
0 answers
132 views

Fourier transform of the electrical conductivity function

In this pdf https://studylib.net/doc/18704299/chapter-1 the author writes that the Fourier transform of the current density is: $$ \Delta j_{i}(\mathbf{k}, \omega) \equiv \frac{1}{(2 \pi)^{2}} \iiiint ...
Logi's user avatar
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0 answers
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MOSFET current at very low temperature (4K)

I am trying to model the current at low T. To do so I need to compute the integral between the fermid diract statistic and the conductivity, with respect to energy. My problem is that I cannot ...
Sarah's user avatar
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0 answers
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Electrical conductivity circuit help, with two solenoids

I have a project im working on but cant seem to figure out the basic of the circuit. The principal of the circuit is two solenoids wrapped around a chemistry glass making a magnetic field. The purpose ...
Ben's user avatar
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3 answers
440 views

Can someone explain this grounding phenomenon?

I went into a conversation with an electrical engineer. Here is what was on the table: Me: How do you connect a two-phase load to a three-phase delta load? If the loads were Y-connected, then you ...
Wais Kamal's user avatar
0 votes
1 answer
131 views

Is there a name for this type of connection? [closed]

I can't think of a time when I've encountered this, but I think that this is a thing: you have two conductive paths that, when connected, become one path. How they become connected is through tension/...
John Doe's user avatar
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1 vote
1 answer
3k views

Thermal pads, their thickness and conductivity

I would like fo know how do thermal pads work, more specifically why does their thickness matter so much even more so than their actual conductivity numbers sometimes and how do I choose the proper ...
appwizcpl's user avatar
  • 911
0 votes
0 answers
79 views

Conductivity vs Attenuation

Attenuation of em waves, when they travel over a surface, happens because the em waves induce a current in the surface and loose energy. EM waves travel farther over sea/ocean. Conductivity of sea/...
Amir's user avatar
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0 votes
1 answer
91 views

Need of semiconductor instead of conductors for changing conductivity

Is changing conductivity is one of the reason to use semiconductors? When we can change conductivity of metals(by some means) then why do we need semiconductors instead in most of the electronic ...
user215805's user avatar
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0 answers
352 views

Low Power Toroidal Conductivity Sensor Inconsistent Values

I have been trying to build a low power toroidal liquid conductivity sensor using the principle given in this image. This link has more information about the principle behind the sensor. What I have ...
Harid444's user avatar
0 votes
1 answer
175 views

Material selection of heating element

I am interested in heating coils which are heated using Ohmic/Joule/resistive heating - specifically, how the material for the heating coil is selected. When I read about heating coil materials - ...
EddieP's user avatar
  • 273
0 votes
1 answer
88 views

Nichrome powder acting as a resistor

I’ve been doing some experiments recently with metal powders and I’m wondering if someone can help me interpret the results and give me some advice. I wanted to test how the metal powder would work in ...
EddieP's user avatar
  • 273
-1 votes
5 answers
3k views

Would you approve this soldering job? [closed]

I am new to soldering, and I am not sure if I did a good job while trying to solder some pins into a HX711. My concern is that the solder in SCK and VCC are touching (also E+ and E-), so I thought ...
Johan Arcos's user avatar
0 votes
0 answers
153 views

What is the TDS and Conductivity of Ice from freezer, when, it has turned liquid?

Condensation of water vapors makes it distilled. I was wondering if the Ice formed inside the freezer top chamber can be used as distilled water. I tried checking the resistance with multi-meter, ...
Srijib Mandal's user avatar
0 votes
1 answer
184 views

Why no conductivity with this wire?

These are two ends of the same cable: The cable comes from an old headphone set and I want to re-purpose it. What are those copper looking wire strands? I could not get connectivity between them and ...
Old Geezer's user avatar
0 votes
0 answers
40 views

Measuring conductance of the material used in fabricating Antenna

I have a composite polymer material with injected conductive particles inside it, making it a not-so-perfect conductor. I have also fabricated a simple dipole antenna using the wires made of the ...
Anonymous's user avatar
1 vote
1 answer
196 views

What material should I use for the plates of my homemade mica capacitors?

I recently acquired some mica as i want to build my own high voltage (50 kV if possible) capacitors. The problem I am encountering right now is that the surface of such a crystal isn't perfectly flat ...
hanslhansl's user avatar
1 vote
1 answer
137 views

Finding free electron concentration to check authors' calculations for electron drift velocity

I am currently studying Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk. Chapter 2.5.1 How the Shape of a Conductor Affects Resistance presents the following image: I ...
The Pointer's user avatar
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0 votes
1 answer
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Main water line TDS measurement grounding

I am trying to implement a TDS sensor to measure a main water line connected pipe, with circuitry that is powered from the wall. My TDS circuit is essentially a two electrode conductivity probe ...
pbandjazz's user avatar
  • 337
0 votes
1 answer
51 views

How do I find the resistive energy deposition of a flat braided aluminum?

I have a flat aluminum 6061, and the measured resistance is 0.5mOhms. I have read that the resistive energy deposition is proportional to the action integral of the lightning current. In the end, I ...
Sam Shurp 's user avatar
0 votes
1 answer
572 views

How good is the Paracord 550 as an electrical insulator?

So following wikipedia the Parachute cord 550 is made from nylon Kernmantle rope, however this site where I sourced the cables from says that it is made of a Polyester sleeve (outer layer) and a core ...
appwizcpl's user avatar
  • 911
0 votes
1 answer
74 views

Can you effectively run lower power 5V TTL signals through a large piece of metal?

Is it possible to run a standard TTL signal through a very large piece of metal? For example, say 1-3 meters of metallic rebar?
Tim Holt's user avatar
  • 319
0 votes
1 answer
412 views

Are there any low temperature (60 - 100 degree celsius) soldering pastes?

I'm looking for low temperature soldering paste that doesn't come in a wheel of filament. It seems tin and bismuth soldering pastes have a melting point of around 160 degrees Celsius. Are there any ...
nick carraway's user avatar
-1 votes
1 answer
38 views

What material characteristics are most important for heating element material selection?

I want construct a heating element by screen printing a flat coil pattern of conductive paste onto an insulated substrate. This conductive paste consists of a powder of conductive metal contained in a ...
EddieP's user avatar
  • 273
1 vote
3 answers
516 views

Conductivity of liquids (3D resistor network)

Hi I'm an electrical engineer but have not seen this problem before. I'mn trying to measure/calculate the resistance of a liquid. Background: I'm working on an electronic device that can come in ...
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