mercmobily:

Conductance is seen as 1/R. It's me mathematical "reciprocal". But... what happens when you actually *see* them?

If you can literally *see* resistance and conductance you're a better man than I.

While it's true, "the lower the resistance, the bigger the conductance", while resistance is linear (y=x), conductance is not: you can see how the conductance curve is in fact anything but linear.

What nonsense are you on about? Conductance is perfectly linear. G + G = 2G after all, just like R + R = 2R.

Using your graph, I could just as easily say that *resistance* is nonlinear by plotting G against 1/R. Now conductance is straight and resistance is curved. That's not what the graph actually says though, because you are misinterpreting it quite badly.

The resistance curve means nothing. Any quantity plotted against itself is going to result in a straight, unity-slope line (y=x). The resistance of a substance plotted as a function of its resistance is a tautological function that has literally no value. The only functions that have any meaning are when one value is plotted against a *different value* to show the relationship between them.

So plot R on the x axis and G on the y axis, and you get that 1/x function.

Now plot G on the x axis and R on the y axis. Anything change? How is one any more or less linear than the other?

How do you see this in an "intuitive" way? From an intuitive point of view, conductance would be linear just like resistance -- that is, intuitively speaking, as resistance goes up, conductance would go down proportionally.

Conductance *does* go down proportionally. If resistance is doubled, conductance is halved. Conversely, twice as much conductance works out to half as much resistance.

Do you have the same trouble with period and frequency? They have a reciprocal relationship too. The unit for period is seconds per cycle, and the unit for frequency is cycles per second. t=1/f, and f=1/t.

Similarly, ohms can be expressed as a derived unit of **volts per amp**, and conductance is **amps per volt**.

MarkT:

The symbol for conductance is G, not C. C is the coulomb!

I = VG

[ yes G is also the gravitational constant, but its deemed not to be so common in the world of electronics as the unit of electric charge! ]

Actually, the symbol for charge is Q, just like I is for current. C is the unit abbreviation for coloumb, like A is the abbreviation for ampere.

C is the symbol for capacitance.