Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [conductance]

A direct measure of how well a material conducts with higher numerical values meaning that the conductor conducts better. It is the inverse of resistance. The units of conductivity are \$ \Omega^{-1}\$ - not to be confused with conductivity that is similar.

27 questions
20
votes
4 answers

Why does solder not conduct sometimes?

I was reflowing and a 2K 603 resistor partially tombstoned. There was solder connecting the lead to the pad, yet my DMM showed an open. When I heated both ends and the resistor came down and contacted the pad, the DMM read 2k ohms like it should.…
Bill
  • 2,496
  • 4
  • 25
  • 36
5
votes
2 answers

Why can't electrons leave the surface of a conductor?

At room temperature, no free electrons can ever leave the surface of the metal. A free electron cannot escape the coulomb (electric) attractive forces presented by the positive metal ions in the lattice. (We'll see later that under special…
dfg
  • 1,161
  • 1
  • 21
  • 38
5
votes
2 answers

Should I ground an aluminum front panel?

I am building a power supply and it will be housed in a plastic case with a fan. I understand the wisdom of grounding a metal case, but in my case (no pun intended) I have an aluminum front panel. Should I ground it? My feeling is yes, but I want to…
user148298
  • 2,215
  • 5
  • 36
  • 51
4
votes
1 answer

Use water as a conductor for a circuit powered by 1.5v battery

I've tried to create this quite simple circuit. V1: 1.5 v (AA battery) LAMP1: 1.5 v, 0.2 a (E10 incandescent light bulb) "Salt water": 10 ml regular water + 1 g salt When I connect the wires together, the lamp lights up. When I connect the wires…
Umpa
  • 43
  • 5
3
votes
1 answer

How to find electrical conductivity from frequency in my PLC project

I am using a 555 timer which is supposed to measure the electrical conductivity of milk. Here's a circuit for a conductivity sensor: It provides the needed isolation, uses AC measurement, and the output is a frequency which I have wired into my PLC…
Debbie
  • 31
  • 1
  • 2
2
votes
0 answers

Common term for Resistance and Conductance?

Simple question; Impedance and Admittance are complementary quantities, and can be described by the common term "Immittance". Likewise Resistance and Conductance are complimentary quantities, do we have a word to describe both of these, like…
Vinzent
  • 2,233
  • 5
  • 18
2
votes
1 answer

Effective resistance of a NMOS

How do we calculate effective resistance of a NMOS, operating in linear region across drain and source?
helloworld1e.
  • 109
  • 1
  • 1
  • 7
2
votes
3 answers

Conductance in a transmission line

I'm just trying to clarify the transmission line concepts in my head. Now wikipedia (that great source of always reliable information) defines the conductance in the transmission line as The conductance G of the dielectric material separating the…
George Wilson
  • 123
  • 1
  • 1
  • 5
2
votes
2 answers

Simple circuit reacts to touching a node

I am trying to repeat a circuit from this post. For some reason it does not work properly, and trying to fix it I figure out strange behavior. LED turns on if I touch R3 with my finger or with something that conducts electricity. What can be the…
Alexander Solovets
  • 141
  • 4
1
vote
2 answers

Is conductivity equivalent to conductance per unit length?

Conductivity is measured in units \$S/m\$. Conductance is units \$S\$, and length is units \$m\$, so conductance per length would also be \$S/m\$. Does this mean conductivity and conductance per length are equivalent? The units match, but I have…
Phil Frost
  • 56,804
  • 17
  • 141
  • 262
1
vote
0 answers

BJT common emitter output conductance

I constructed in multisim a common emitter circuit from the following diagram where the lower Keithley is used to supply VBE and the upper Keithley is used to supply VCE. I obtained the IC- VCE characteristic curves using the following…
Ture
  • 111
  • 1
1
vote
1 answer

How to build a human chain detection circuit?

I've seen devices that detect a human chain. For example, they detect when 1 or more people (possibly several) hold hands to close a circuit between two distant metal objects. I've tried to find instructions on how to build a circuit like this,…
Mark Stevens
  • 57
  • 7
1
vote
2 answers

Transfer function of Operational Amplifier

I am trying to solve the following operational amplifier circuit to get its transfer function. I have tried two different approaches, one is elementary approach by finding V- and V+ and equating them. But problem with this approach is that the…
Jarnu Girdhar
  • 13
  • 2
1
vote
2 answers

Value of omega from forced response V0

Based on figure. Maybe a simple question, but I'd like to know why that if forced response is zero, then $$\omega L = \frac{1}{\omega C}$$ where \$L\$ is the inductance and \$C\$ is the capacitance. Where in this case, \$\omega\$ can be solved for…
VincentJ
  • 35
  • 2
  • 5
0
votes
2 answers

Line resistance >> line reactance or the other way around?

Grainger and Steven write in Power Systems Analysis that "in a well-designed and properly operated power transmission system... the line susceptances Bij are many times larger than the line conductances Gij" (where the subscripts i and j refer to…
artist_and_not_EE_by_training
  • 398
  • 2
  • 12
1
2