All Questions
Tagged with material-science electric-current
13
questions
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Determining the condcutivity of a material by method of contactless resistance caused by putting a sample rod in the inductor of an RLC circuit
I'm doing an experiment where I'm trying to determine the conductivity of a material by putting a sample rod in the center of a coil which is a part of an RLC circuit with an AC generator.
I was told ...
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1
answer
65
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What is current density and is it a material property?
Current density has the units (Ampere/cm2) so by that is the total current flowing through a cross-section divided by the area of that cross-section.
I'm working on developing a water electrolyzer ...
- 3
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195
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Drift current and diffusion current in depletion region of diode at equilibrium
The diffusion current for a diode at the edge of the depletion region is $I_D=I_S(e^{qV_A/VT}-1)$. Under an unbiased condition$(V_A=0)$ at equilibrium, $I_D$ will be $0$. The drift current should be ...
- 135
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44
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Are YBCO or BSCCO rods able to superconduct at full $J_{c}$?
My understanding of the state of the art for superconducting cables is that ceramic powder is manufactured, then it's packed very tightly into a silver tube. I'm not sure how this is supposed to solve ...
- 66
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34
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Can you perfectly control electric currents' behavior in anisotropic media?
I'm an undergrad who is learning recently about anisotropy w.r.t. E&M. I understand that in anisotropic media the behavior of electric currents and other E&M aspects can be very unpredictable ...
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3
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51
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Is there any material available whose strength changes with an input stimulus, say current or magnetic field etc?
Is there any material available whose strength can be controlled by varying an input stimulus like current flowing through the material or magnetic field without actually deteriorating the material ...
- 43
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30
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Experimental material impedance measurement
Imagine you have a square-shaped plate of conductive material to which you connect 3 electrodes E1, E2, and E3 (as shown in figure below). Suppose we assume for this plate a 'pi' (aka delta) two-port ...
- 33
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143
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In an intrinsic semiconductor, are there the same number of carrier electrons and holes? Or this is just exclusive for silicon?
I am working with some polymers that behave like semiconductors when they are plugged into the current.
I am calculating the mobility of these polymers and I need the value of the current density (J) ...
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1
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279
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Current passing through two connected wires from different materials
Does the current change when it passes from the copper wire to the aluminium wire or does its value stay the same?
Picture to illustrate the question
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1
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72
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$\mu \rightarrow \infty $ in magnetized cylinder
Please don't see this as a homework question, for I have already solved the problem and all I'm trying to do is understand the results and make a correct interpretation. In a cylinder made out of ...
- 151
3
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3
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865
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Why alloy have more resistance?
Is there any simple way to understand why alloy have more resistance than metals?
My teacher ask this, I answer that, there might be more free electrons in metals than an alloy, but she said you are ...
- 299
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195
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Why should we use good conductors as electrodes of a capacitor?
I was asked if and why why should the electrodes of a capacitor should be good electrical conductors.
It seemed obvious to me that if I want to form a Helmholtz double layer (because that's what ...
- 1,334
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4
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955
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What is Conductance?
What is conductance? I am being said that conductance is inverse of resistance?I do know that resistance is the opposition to the flow of current but do not get conductance?
I do know that:it is ...
- 897