Questions tagged [thermoelectricity]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
0 answers
37 views

How to prevent a nichrome wire from melting under variable energy? [closed]

I’m experimenting with a DIY “sand battery”, but I recently hit a wall. The “battery” is a pot lined inside with insulator and filled with sand. The sand is heated by a nichrome wire placed at the ...
Sophivorus's user avatar
1 vote
1 answer
33 views

Does Peltier element become a weaker thermo-insulator when taking off power?

Imagine we have two bodies (environments) with different temperatures connected to each other through Peltier element. Say, one body has temprature $T_l$, the other $T_h$. For the sake of experiment, ...
user129516's user avatar
1 vote
1 answer
45 views

Why are junctions used in thermocouples?

Thermocouples work on the principle of the Seebeck effect. In the simplest one-dimensional form, the voltage appearing between two points on a conducting solid having a temperature difference of $\...
Len's user avatar
  • 141
1 vote
0 answers
96 views

Single metal Seebeck effect in a ring in the presence of a magnetic field

According to the usual Seebeck effect, you can make a loop of wire with two different metals, apply a temperature difference between two opposite sites of the ring and measure a current. See picture ...
Mauricio's user avatar
  • 4,394
1 vote
2 answers
76 views

Thermoelectric effect

Hey just learned about this thermoelectric effect in physics class, I was wondering why it is not used more often in the form of a thermoelectric generator in practical industrial applications. Would ...
Fakhryou's user avatar
0 votes
2 answers
253 views

A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of? [closed]

A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of: A) More length B) Less radius C) Less length D) More radius I think the correct answer is ...
Bhavya Jain's user avatar
0 votes
1 answer
42 views

Does the volume of water going over a hydroelectric dam matter? [closed]

How does the volume of water going over a hydroelectric dam affect electricity production? Could the flux of the generators not be modulated to different amounts of electricity with the same flow of ...
Derek Seabrooke's user avatar
1 vote
0 answers
35 views

How fast does a Peltier change temperature? [closed]

I am developing a project using peltier element tec1 12706. I want to achieve a hot side temperature of 60 degrees celsius in a matter of seconds after starting the power. It's not for an operating ...
Angel Miladinov's user avatar
0 votes
0 answers
36 views

TEC reverse polarity

Imaging a TEC element has a mass with fixed temperature of 25C on the hot side and another mass on the cold side that starts with say 1 joule of enthalpy. Assume the whole system is contained in a ...
selene flemming's user avatar
1 vote
1 answer
134 views

Seebeck Effect in a homogenous material

Two materials are usually necessary to manifest the Seebeck effect. However, the Seebeck effect occurs when we apply a temperature gradient to a material, and this material produces a potential ...
Brising's user avatar
  • 23
-1 votes
1 answer
131 views

What is the maximum temperature gradient between two points? [closed]

What is the maximum temperature gradient between two points? If the environment material affect the solution, you can assume that the environment is vacuum. For example, can we change the temperature ...
mohammad rezza's user avatar
3 votes
0 answers
41 views

What is the temperature at the center of a square plate subjected to 4 different temperature at each edge? [closed]

Dear all, assuming temperatures have all reached steady-state, is the center temperature will be exactly (T1+T2+T3+T4)/4 assuming this is a square plate with 4 different temperature at each edge?
jessica smith's user avatar
1 vote
0 answers
21 views

Heat release from a uncoated vs coated titanium [closed]

Is heat released quicker in a titanium (uncoated) metal or titanium with silicone coating?
user28833's user avatar
  • 111
1 vote
1 answer
58 views

Ohm and Fourier's law with Seebeck effect - derivation?

In my work, I am dealing with a mathematical model which involves thermoelectric magnetohydrodynamics (TEMHD). Ohm's law becomes modified to become $$ \mathbf{J}=\sigma\left(\mathbf{E}+\mathbf{u}\...
OGBond's user avatar
  • 21
0 votes
1 answer
5 views

Can we just consider thermionic emission as a kind of thermoelectricity?

I read some thermionic applications, specially the magnetron one with a cathode and an anode. Technically, it seems that the emission of electrons will go towards the anode (cold temperature) whenever ...
Abdoulaye ndiongue's user avatar
0 votes
2 answers
183 views

Is there a steady state for two conductors at different temperatures connected to a battery?

In order to understand better nonequilibrium statistical physics I came up with the following thought experiment. I wonder what are the requirements to obtain a steady state. Let us consider two ...
Mauricio's user avatar
  • 4,394
2 votes
2 answers
81 views

Will Heat transfer through a metal be faster, if an electrical frequency is applied to the metal

Will a metal conduct heat faster if an electrical current is applied to the that metal ? For instance if a frequency current such as the same that would go to a speaker - so like 30 hz or 50hz or 1khz ...
donny Matteson's user avatar
0 votes
1 answer
34 views

What is the energy in a circuit with a temperature difference and no potential difference

Suppose I have some kind of thermoelectric effect, where there is an electric current flowing from a hot to a cold electrode. If there is no bias voltage $V$ and there is a current $I$, the energy ...
Mauricio's user avatar
  • 4,394
2 votes
0 answers
138 views

Calculating Peltier efficiency

This is half Skeptics SE , half here. Please help me proving this Kickstarter is baloney. Besides the stupid marketing claims what we have here is a neck band shaped portable device of 180x177x45mm ...
chx's user avatar
  • 153
0 votes
1 answer
101 views

Thermoelectric Thomson effect as generator

In thomson effect we need an electrical current and a temperature difference at the same time. So it is possible use Thomson effect to generate an electric current? That is, how I generete an electric ...
Brising's user avatar
  • 23
1 vote
1 answer
391 views

Seebeck and Peltier effect vs Thomson effect - conductors difference

Both Seebeck effect and Peltier effect we have the need of two dissimilar conductors to break the symmetry of the system to produce a current. But, why in the Thomson effect we just need one conductor,...
Brising's user avatar
  • 23
0 votes
0 answers
30 views

How might the hypothetical "Dyson sphere" convert the energy from the sun to usable electricity?

I have tried to find the answer but it appears that this question was never asked. I consulted my teachers but they do not have any knowledge of this either.
Hrishiraj's user avatar
2 votes
1 answer
220 views

Absolute Seebeck coefficient of metals

Note: In literature, the Seebeck coefficient is most often given to platinum as a reference point, because it is challenging to measure the absolute Seebeck coefficient. It is however possible, this ...
SeebeckWhy's user avatar
1 vote
1 answer
35 views

Using simple logic instead of the thermoelectric series

A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will The answer is - Flow from Antimony to ...
Intermechanic's user avatar
1 vote
2 answers
96 views

Efficiency of thermoelectric material and Carnot

Is Carnot efficiency also relevant for "open systems"? Example - If we take a thermoelectric material with the hot side connected to a stable heat source and the cold side to an infinite ...
Dekel Golan's user avatar
0 votes
2 answers
53 views

Thermal power station powered by temperature difference between high and low altitude air

Would it be feasible to build a system where warm air from sea level is pumped to the top of a mountain to power a thermal power station? With a lapse rate of ~ 1°C / 100 m there should be plenty of ...
adius's user avatar
  • 101
1 vote
1 answer
45 views

The opposite of thermionic emission

"Thermionic emission is the liberation of electrons from an electrode by virtue of its temperature (releasing of energy supplied by heat). This occurs because the thermal energy given to the ...
noodles's user avatar
  • 59
1 vote
0 answers
90 views

Is Seebeck coefficient for a metal related to Fermi level as it is the case for contact potential?

When putting together two different metals a so called "contact potential" will be built up. So far I understand this is because the combined system wants to reach an equilibrium where free ...
MichaelW's user avatar
  • 997
3 votes
2 answers
421 views

Is there a theoretical efficiency limit for thermoelectric generators?

Typical Thermoelectric/Seebeck generators operate at 5-8% efficiency. Is there an upper limit to the conversion of heat flux (temperature differences) directly into electrical energy?
2080's user avatar
  • 235
1 vote
0 answers
42 views

Joule heater physics

Why does a joule heater element heat up from the middle outwards to the ends? In the picture below, the kanthal mesh heating element is shown heating up from the middle outwards. I'm looking for an ...
Buk's user avatar
  • 11
3 votes
1 answer
47 views

Will withdrawing electricity via a thermoeletric device cool a whole closed system?

If a hot and a cold container are placed thermo sealed system, and a thermoelectric device is used between them and electricity is withdrawn that way, will the resulting entropic temperature in both ...
Freud Chicken's user avatar
-1 votes
1 answer
61 views

Is it theoretically possible transfer thermal energy to electrical?

I was searching web trying to find answer, but all I found are thermoelectrical generators which work on principle flowing electrons from heat to cold material and efficient is very low. I am ...
Shiro's user avatar
  • 1
1 vote
2 answers
49 views

How can I experimentally check that the voltage in a thermocouple is generated be the gradient in the wires and not by the junction themselves?

I just found out on Wikipedia (also here and there) that the voltage in a thermocouple in not generated by the cold & hot junctions, but by the temperature gradient in the wires which generates a ...
Camion's user avatar
  • 555
2 votes
1 answer
88 views

What is the best way to generate electricity using fresnel lens? [closed]

I have a fresnel lens which I want to put to use for generating electricity. My house receives ample sunlight. What is the best way of going about it? Stirling engines, steam driven turbines are some ...
Amit Agarwal's user avatar
0 votes
0 answers
382 views

Why did my peltier modules stay warm inside vacuum?

My problem is a bit more complex, but I will do my best to describe it. I have assembled the following setup: I want to acheve the lowest possible temperature in vacuum on top of my stacked Peltier ...
rtratajczyk's user avatar
2 votes
2 answers
310 views

Could you electrically charge a liquid or granules to refuel EVs with it?

Is there a physical law that would make an electrically charged liquid or granules impossible to produce? Theoretically it should be possible to refuel an EV by adding two different liquids to it in ...
Hendrik's user avatar
  • 21
2 votes
1 answer
257 views

Formula for Temperature Gradient due to Joule Heating [closed]

I was wondering how to calculate how much the temperature will increase in a cylindrical wire due to current passing through it, I did some googling didn't find anything so I came up with the ...
AGawish's user avatar
  • 165
0 votes
1 answer
53 views

Polarity definition of thermoelectric effect

After a brief search of the internet the polarity definition for thermoelectric voltage is not found. Let conductor X cross a temperature gradient where temperature A is higher than temperature B. ...
Doege's user avatar
  • 123
1 vote
0 answers
55 views

Can waste heat in specific environments be collected into photons and converted to electricity? [closed]

Crossposted on Engineering SE Here and here show possibility to combine photons of lower energy to one higher. Thinking of an application, it could be used to dissipate heat from laptop. Liquid ...
Kav's user avatar
  • 129
1 vote
0 answers
171 views

What does a voltmeter real measure in case of a pn junction?

I recently learned, that a voltmeter doesn't measure difference of electrical potential but difference of electrochemical potential $\tilde{\mu} = \mu/e + \Phi$. My original question was about ...
MichaelW's user avatar
  • 997
0 votes
0 answers
30 views

What voltage is needed to ionize oxygen at the centre of this ball and would we hear any noise from thunder?

The outer ball is 10 metres in diameter (its surface is the Earth's atmosphere) and a vacuum separates the outer ball from a 1 metre ball of atmospheric air which exists at atmospheric pressure. The ...
user avatar
0 votes
0 answers
37 views

Could this imaginary cooling solution work?

Imagine a perfectly insulated ideal closed cylinder. Inside, at the two ends there are two bodies, one with the temperature of T the other with temperature -T. Between the almost touching bodies with ...
Dominik's user avatar
  • 89
1 vote
0 answers
60 views

Seebeck Coefficient variation with Fermi Energy at different Temperartures for the Same Material

So we have been recently introduced to the Seebeck Coefficient in thermoelectrics, however, I had some questions on it, and I kept finding contrasting information online, maybe because I don't know ...
Sputn1k's user avatar
  • 11
0 votes
2 answers
19 views

Reaction to increase and diminish mass at will (forward and reverse reactions) [closed]

Non-professional question... Is there currently a method for converting mass to/from another form of energy? This would be like an exothermic reaction in that mass is consumed, but it would also have ...
GDHPrinter's user avatar
0 votes
0 answers
28 views

Thermoelectric Seebeck Crystalline Structure

Recently reading about Crystalline Structure in metals and other forms of doping. Being that thermal energy has so called phonons could it be that crystals in metal having an effect like that for ex. ...
William 's user avatar
1 vote
0 answers
130 views

Does a temperature gradient in a single metal rod generate an electric field?

Based on this question, I was trying to understand what happens with the electrons when there is a gradient of temperature between the ends of a metal rod. I put the contacts of a voltimeter at the ...
Claudio Saspinski's user avatar
2 votes
3 answers
423 views

Is Joule's law of heat generated by electricity only applicable for ideal resistors?

I have learned about Joule's law of heat generated by electricity. It states that $H=VIt=I^2Rt$. But here's where I'm confused: if the whole electrical energy does not get converted into thermal ...
Md. Hasibul Hossain's user avatar
2 votes
1 answer
138 views

If there is no limit to $ZT$, why are there no materials with $ZT>3$?

It is well understood that the thermoelectric performance of a material (described by the parameter $ZT $ ) has no transport related upper theoretical bound. This means a material can exist that can ...
mcodesmart's user avatar
  • 3,103
1 vote
1 answer
137 views

How can I understand Luttinger's theory of thermal transport coefficients?

I am trying to understand Luttinger's research paper Theory of Thermal Transport Coefficients, J. M. Luttinger Phys. Rev. 135, A1505 – Published 14 September 1964 While I am able to understand the ...
1 vote
1 answer
74 views

Peltier Effect in Nature?

Are there examples of the Peltier effect occurring naturally, or has it only ever been artificially produced? Has there ever been what amounts to a 'natural refrigerator' discovered? And what would be ...
OddGamer's user avatar