# 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.

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1answer
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### Conductance per unit length

I want to measure the conductance per unit length of a transmission line consisting of two parallel wires. Below you see a possible set up with an ohm meter and the transmission line. Would it be ...
1answer
46 views

### How to rewrite this equation?

How can the following equation which represents two series resistors (a & c) in parallel with a third resistor (b) be written in terms of conductance?
0answers
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### 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,...
1answer
86 views

### what are the exact formulas for calculating the matrice elements Lo, Co, Ro, Go, Rs, Gd

The following code is a hspice code. what are the exact formulas for calculating the matrice elements Lo, Co, Ro, Go, Rs, Gd? In other words, I want Lo, Co, Ro, Go, Rs, and Gd calculation formulas. ...
1answer
70 views

### Can Network Analyzer measure Impedance, Conductance, Susceptance or is there a device that does all?

I want to measure the impedance, conductance and susceptance of a large metallic object (about the size of a boat), and I want to know if it is possible to measure using Network Analyzer. If yes, are ...
1answer
229 views

### Effective resistance of a NMOS

How do we calculate effective resistance of a NMOS, operating in linear region across drain and source?
1answer
241 views

### 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 ...
0answers
121 views

### Combining ECG and EDA (skin conductance) in the same chest electrodes. Possible and how could it be done?

Currently I'm designing a wearable, battery powered module that combines several sensors into a single device. In this device are modules for both ECG measurement (heart beat) and EDA (skin ...
2answers
144 views

### 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 ...
1answer
906 views

### Resistance of twin core wire

I'm trying to do a problem for revision and I'm running into problems calculating the resistance of this circuit used to approximate a twin-core wire. It's used later in the question with the middle ...
2answers
2k views

### What does it says the transconductance efficiency (gm/Id) in an amplifier?

I understand the concept of the transconductance but it's not clear what does the transconductance efficiency (gm/Id) mean. Since gm is the variation of Id to the Vgs or vin voltage... What is the ...
3answers
596 views

### Light LED light?

I would like to mount 10 or 20 white LED on a thin rod, about 2 m long - and around 3 mm in diameter. I will need to accept various compromises for conflicting requirements, but I try to understand ...
2answers
1k views

### 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. ...
2answers
2k views

### 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 ...
1answer
170 views

### Calculating R with 2 resistors parallel

I've ran into a slight confusion. The equation for resistance in a parallel circuit should work for any number of resistors, I assumed. So when I'd have 2 resistors in parallel, total Rt would be: ...
3answers
14k views

### 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 ...
2answers
601 views

### 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 ...
1answer
2k views

### 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 ...
2answers
5k views

### 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 ...
2answers
3k views

### 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 ...
1answer
6k views

### 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 ...
4answers
14k views

### 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 ...