Conductance,Susceptance,Admittance? - Page 2 - Electronic Circuits Projects Diagrams Free

ljcox · 16th June 2005, 10:57 AM

Quote:

Originally Posted by walters

But what does reciprocals mean in this way ? because this is applied reciprocals the reciprocal of x is 1/x

Like a resistor has resistance and conductance Yes

When i put my meter on the resistor i measure resistance how can i
measure the conductance? divide the resistance into one or modify the meter to read conductance.

A capacitor has capacitance and conductance how do i measure the
conductance from the capacitor? A cap does not have conductance, it has reactance, the reciprocal of which is susceptance. To measure - apply a voltage and measure the current. X = V/I and B = I/V

A inductor has inductance and conductance how do i measure the
conductance from a inductor Same argument as for Cap above?

admittance,conductance,susceptance how are these terms applied
to a circuit i never measured these before so i don't know how
these terms affect a circuit or what they do really

admittance what is its function in a circuit? It is the constant of proportionality between current and voltage. Y = I/V

conductance what is its function in a circuit? G = I/V

susceptance what is its function in a circuit? B = I/V

You seem to be making this much more difficult than it really is.
See that attachment for an example of how Y, B & G are used

Len

walters · 16th June 2005, 11:08 AM

Thanks ljcox for the information

Is siemens unit measured in TIME because i see mS, uS ?

ljcox · 16th June 2005, 11:11 AM

Quote:

Originally Posted by walters

Whats the difference between Admittance VS Impedance?
1.) A measure of the ability of a reactive circuit to permit current
2.) The reciprocal of impedance
3.) ( Y )

Whats the Difference between Conductance (G) VS Resistance?
1.) The ability of a circuit to allow current
2.) The reciprocal of resistance

Consider Ohm's law V = R I The resistance R is the constant of proportionality between V and I. Now you can transpose such that I = V/R. Or alternatively, you can write it as I = G V. So G is the constant of proportionality between I and V.

Inductive Susceptance (B)(L)
1.) The Ability of a inductor to "PERMIT" current Yes
2.) The reciprocal of inductive reactance Yes

Capacitive Susceptance (B)(c)
1.) The Ability of a capacitor to "PERMIT" current Yes
2.) The reciprocal of capacitive reactance Yes

This is my main problem is this

:Conductance (G) is the reciprocal of resistance:

What does this mean the reciprocal of resistance
What is conductance?
is Conductance The unit of conductance is mho which is Ohm spelt backwards.
a.) ohms?
b.) what is it really?
Does the reciprocal- mean its the opposite of resistance?

:Susceptance (B) is the reciprocal of reactance:

What does this mean the reciprocal of reactance
What is susceptance?
is susceptance The unit of susceptance is mho.
a.) ohms?
b.) reactance buts its not reactance its a different kind of
reactance but what kind i never measured this for a
circuit im new to this susceptance reactance?

: Admittance (Y) is the reciprocal of impedance :

What does this mean the reciprocal of impedance?
What is admittance
is admittance The unit of admittance is mho.
a.) ohms?
b.) impedance but what kind is this "admittance impedance"?

ljcox · 16th June 2005, 11:22 AM

Quote:

Originally Posted by walters

Thanks ljcox for the information

Is siemens unit measured in TIME because i see mS, uS ?

Siemens is the alternative unit for G, B & Y. I use mho as I said in another post.

ms = milliseconds and has nothing to do with Siemens.

However, mS is the abbreviation for milliSiemens.

Units named after people start with an upper case letter, eg. Volt, Ampere, Watt, etc. hence mV, mA, mW.

Len

walters · 16th June 2005, 11:25 AM

mS is the abbreviation for milliSiemens.

but is milliSiemens a TIME measurment?

what is millisiemens really is it time of current or conductance?

ljcox · 17th June 2005, 12:18 AM

Quote:

Originally Posted by walters

mS is the abbreviation for milliSiemens.

but is milliSiemens a TIME measurment?

what is millisiemens really is it time of current or conductance?

As I said in my previous post, Siemens is the alternative unit for conductance. I use mho but some people use Siemens.

Len

Morgen · 17th June 2005, 12:34 AM

re•cip•ro•cal adj corresponding but the other way around reciprocal n. a mathematical expression related to another in the way that 2/3 is related to 3/2

walters · 17th June 2005, 01:18 AM

Thanks guys for help on this stuff

Can you please give me like a water analogy for these terms
admittance,conductance,susceptance?

This inverse is not making sense to me at all i need another way
to look at these terms because i can't picture these in my mind

This inverse is my main problem this inverse doesn't make sense
to me at all what really is a inverse because this is applied inverse
to a compondent or a circuit so its the inverse

I have some questions Please don't say its the inverse of resistance,
impedance, reactance this inverse doesn't explain to me why or
what Admittance , Conductance , Susceptance Does?

Compondent questions:

A resistor has 1.) Admittance? but what is it? what does it do?
2.) Conductance? but what is it? what does it do?
3.) susceptance? but what is it? what does it do?

a Capacitor has 1.) Admittance? but what is it? what does it do?
2.) Conductance? but what is it? what does it do?
3.) Susceptance? but what is it? what does it do?

a Inductor has 1.) Admittance? but what is it? what does it do?
2.) Conductance? but what is it? what does it do?
3.) Susceptance? but what is it? what does it do?

circuit questions:

Every circuit has 1.) Admittance? but what is it? what does it do?
2.) Conductance? but what is it ? what does it do?
3.) Susceptance? but what is it? what does it do?

Thanks for helping so much on this stuff

Morgen · 17th June 2005, 03:47 AM

The reciprocals of resistance, reactance, and impedance are conductance, susceptance, and admittance. Respectively.
It is looking at the same thing from two different ways.
For example, if I travel from point A to point B, I can measure either the distance as it increases from point A, or I can measure the decreasing distance to point B. My speed is the same whichever way I measure it.
or
Let's say I push against a brick wall. The resistance of the brick wall can be measured, or the force of my pushing against the wall can be measured.
So a resistance of 1000 ohms = a conductance of 0.001 siemens.
It is looking at the same thing from two different ways (reciprocal).

walters · 17th June 2005, 04:09 AM

Thanks Morgen

"It is looking at the same thing from two different ways" (reciprocal).
Thats a good thought

But to me they seem different because resistance is putting opposition
to current flow and conductance is allowing current to pass so its really
not the same thing its way different to me

They are not the same thing to me this is how i look at it like this:

Same looking at it in different way:
resistance= conductance
reactance= susceptance
impedance=admittance

Not the same to me

Resistance is not the same as conductance
Reactance is not the same as susceptance
impedance is not the same as admittance

This is how i look at it

Susceptance = reactance What kind of reactance its not the same
reactance

Reactance= Susceptance reactance
they can't be the same thing

Admittance= impedance What kind of impedance is this admittance
it can't mean the same thing they are really different
but how ?

Russlk · 17th June 2005, 05:10 AM

To measure resistance, apply a current and measure the voltage. The higher the voltage, the higher the resistance. To measure conductance, apply a voltage and measure the current. The higher the current, the higher the conductance.

A capacitor does not have conductance, it has susceptance and susceptance is not the same as capacitance. Susceptance is the inverse of reactance. Susceptance and reactance are the same thing stated in a different way. For example, if you were in a valley looking at a mountain peak, you would say that is high but if you were on the mountain looking at the valley, you would say that is low. It is the same distance but stated in a different way.

An inductor does not have conductance, it has susceptance and reactance. Inductive reactance is considered positive while capacitive reactance is negative, so when you connect them in series the resultant reactance is the difference.

Impedance is just a term for reactance and resistance where the phase angle is not 0 or 90 degrees.

The inverse of impedance is admittance. Resistance and conductance apply in DC circuits, impedance and admittance apply in AC circuits.

Morgen · 17th June 2005, 06:46 AM

My statement "it's looking at the same thing two different ways" could be confusing. Remember that ultimately it is not "resistance" or "reactance" that we are looking at. We are looking at electron flow. As the electrons flow, there must be a value of -conductance- allowing that flow. But the electrons do not flow freely. There is also a value of -resistance- that impedes the flow.
It's kind of like the old "is the glass half full or half empty?"

walters · 17th June 2005, 06:51 AM

Can you please give me good definition for these terms

admittance? this is a special kind of impedance

conductance?

susceptance? this is a special kind of reactance

Explain what it does to the current and voltage:

Conductance means- to pass current and voltage through the component
easy.
The abilty of a component to allow current

Resistances means- opposition to current through the component

Admittance means- permits current
its a special kind of impendace

Impendance means- the total opposition to AC current

susceptance means-

reactance means- is the property of resisting or impeding the flow of ac current or ac voltage in inductors and capacitors

Capacitive Reactance:
When ac voltage flows through a capacitance an opposing change in the initial voltage occurs, this opposition or impedance to a change in voltage is measured in terms of capacitive reactance.

Capacitive Susceptance means:

Inductive Reactance
When ac current flows through an inductance a back emf or voltage develops opposing any change in the initial current. This opposition or impedance to a change in current flow is measured in terms of inductive reactance.

Inductive Susceptance means:

Morgen · 17th June 2005, 05:43 PM

Quote:

Originally Posted by walters

Can you please give me good definition for these terms

admittance? this is a special kind of impedance

conductance?

susceptance? this is a special kind of reactance

Apparently you have yet to grasp that one is the reciprocal, the inverse, the opposite, of the other. It is definitely NOT "a special kind of".
I don't mean this as sarcasm... Is English your first language? Admit and impede have opposing definitions.

heathtech · 17th June 2005, 07:27 PM

"Walters" has litteraly flooded another forum with the exact same questions, string after string of elementary concepts. He has posted so many times with simple questions that he can't grasp! He has literally achieved a higher ranking on the forums by just posting repetitively. I don't know if he is a student or an idiot sevant, but you will wear yourself thin trying to help!

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16th June 2005, 11:08 AM	#17
walters	Thanks ljcox for the information Is siemens unit measured in TIME because i see mS, uS ?

16th June 2005, 11:25 AM	#20
walters	mS is the abbreviation for milliSiemens. but is milliSiemens a TIME measurment? what is millisiemens really is it time of current or conductance?

17th June 2005, 12:34 AM	#22
Morgen	re•cip•ro•cal adj corresponding but the other way around reciprocal n. a mathematical expression related to another in the way that 2/3 is related to 3/2

17th June 2005, 01:18 AM	#23
walters	Thanks guys for help on this stuff Can you please give me like a water analogy for these terms admittance,conductance,susceptance? This inverse is not making sense to me at all i need another way to look at these terms because i can't picture these in my mind This inverse is my main problem this inverse doesn't make sense to me at all what really is a inverse because this is applied inverse to a compondent or a circuit so its the inverse I have some questions Please don't say its the inverse of resistance, impedance, reactance this inverse doesn't explain to me why or what Admittance , Conductance , Susceptance Does? Compondent questions: A resistor has 1.) Admittance? but what is it? what does it do? 2.) Conductance? but what is it? what does it do? 3.) susceptance? but what is it? what does it do? a Capacitor has 1.) Admittance? but what is it? what does it do? 2.) Conductance? but what is it? what does it do? 3.) Susceptance? but what is it? what does it do? a Inductor has 1.) Admittance? but what is it? what does it do? 2.) Conductance? but what is it? what does it do? 3.) Susceptance? but what is it? what does it do? circuit questions: Every circuit has 1.) Admittance? but what is it? what does it do? 2.) Conductance? but what is it ? what does it do? 3.) Susceptance? but what is it? what does it do? Thanks for helping so much on this stuff

17th June 2005, 03:47 AM	#24
Morgen	The reciprocals of resistance, reactance, and impedance are conductance, susceptance, and admittance. Respectively. It is looking at the same thing from two different ways. For example, if I travel from point A to point B, I can measure either the distance as it increases from point A, or I can measure the decreasing distance to point B. My speed is the same whichever way I measure it. or Let's say I push against a brick wall. The resistance of the brick wall can be measured, or the force of my pushing against the wall can be measured. So a resistance of 1000 ohms = a conductance of 0.001 siemens. It is looking at the same thing from two different ways (reciprocal).

17th June 2005, 04:09 AM	#25
walters	Thanks Morgen "It is looking at the same thing from two different ways" (reciprocal). Thats a good thought But to me they seem different because resistance is putting opposition to current flow and conductance is allowing current to pass so its really not the same thing its way different to me They are not the same thing to me this is how i look at it like this: Same looking at it in different way: resistance= conductance reactance= susceptance impedance=admittance Not the same to me Resistance is not the same as conductance Reactance is not the same as susceptance impedance is not the same as admittance This is how i look at it Susceptance = reactance What kind of reactance its not the same reactance Reactance= Susceptance reactance they can't be the same thing Admittance= impedance What kind of impedance is this admittance it can't mean the same thing they are really different but how ?

17th June 2005, 05:10 AM	#26
Russlk	To measure resistance, apply a current and measure the voltage. The higher the voltage, the higher the resistance. To measure conductance, apply a voltage and measure the current. The higher the current, the higher the conductance. A capacitor does not have conductance, it has susceptance and susceptance is not the same as capacitance. Susceptance is the inverse of reactance. Susceptance and reactance are the same thing stated in a different way. For example, if you were in a valley looking at a mountain peak, you would say that is high but if you were on the mountain looking at the valley, you would say that is low. It is the same distance but stated in a different way. An inductor does not have conductance, it has susceptance and reactance. Inductive reactance is considered positive while capacitive reactance is negative, so when you connect them in series the resultant reactance is the difference. Impedance is just a term for reactance and resistance where the phase angle is not 0 or 90 degrees. The inverse of impedance is admittance. Resistance and conductance apply in DC circuits, impedance and admittance apply in AC circuits. __________________ see my website: www.geocities.com/russlk

17th June 2005, 06:46 AM	#27
Morgen	My statement "it's looking at the same thing two different ways" could be confusing. Remember that ultimately it is not "resistance" or "reactance" that we are looking at. We are looking at electron flow. As the electrons flow, there must be a value of -conductance- allowing that flow. But the electrons do not flow freely. There is also a value of -resistance- that impedes the flow. It's kind of like the old "is the glass half full or half empty?"

17th June 2005, 06:51 AM	#28
walters	Can you please give me good definition for these terms admittance? this is a special kind of impedance conductance? susceptance? this is a special kind of reactance Explain what it does to the current and voltage: Conductance means- to pass current and voltage through the component easy. The abilty of a component to allow current Resistances means- opposition to current through the component Admittance means- permits current its a special kind of impendace Impendance means- the total opposition to AC current susceptance means- reactance means- is the property of resisting or impeding the flow of ac current or ac voltage in inductors and capacitors Capacitive Reactance: When ac voltage flows through a capacitance an opposing change in the initial voltage occurs, this opposition or impedance to a change in voltage is measured in terms of capacitive reactance. Capacitive Susceptance means: Inductive Reactance When ac current flows through an inductance a back emf or voltage develops opposing any change in the initial current. This opposition or impedance to a change in current flow is measured in terms of inductive reactance. Inductive Susceptance means:

17th June 2005, 07:27 PM	#30
heathtech	IMPORTANT; please read! "Walters" has litteraly flooded another forum with the exact same questions, string after string of elementary concepts. He has posted so many times with simple questions that he can't grasp! He has literally achieved a higher ranking on the forums by just posting repetitively. I don't know if he is a student or an idiot sevant, but you will wear yourself thin trying to help! __________________ Freedom isn\'t Free.