# 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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### Name of electric component

The conductance of a resistor is defined to be 1/R. What is the name of a electric element which obeys this law? And how do we draw it in a circuit diagram?
1 vote
64 views

### 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 ...
144 views

### Is there a practical use of conductance? [closed]

What is the reason that conductance exists? Is there a practical reason to use conductance (G = 1 / R [Siemens]) instead of resistance (ohm) or does it only have value for theoretical reasons (which I ...
260 views

### What makes transconductance negative?

Quote... "transconductance is -1 amps/volt" Refer to this link for the source of my question... This reference lacks the negation of A/V while this reference includes it? I'm confused...to ...
117 views

### 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 ...
61 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?
80 views

### 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,...
95 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. ...
77 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 ...
466 views

### Effective resistance of a NMOS

How do we calculate effective resistance of a NMOS, operating in linear region across drain and source?
1 vote
293 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 ...
192 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 ... 1 vote
186 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 ...
1k 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 ...
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 ...
604 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 ...
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. ...
1 vote
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 ...
185 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: ...
16k 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 ...
635 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 ...
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 ...
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 ...
1 vote
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 ...