
Principles of Analog Electronics
98
Following is a summary of the parameters introduced here:
➜ R: resistance [Ohm, Ω]
➜ ρ: resistivity, or specic resistance [Ohm × meter, Ω × m]
➜ G: conductance [Siemens, S]
➜ σ: conductivity, or specic conductance
mor
S
m
1
Ohmmeter
11
×
Ω×
−−
Observation
From what we have said until now, it is reasonable to think that resistance is
expressed by a real number, but it may happen to be expressed with a complex
number, too. In that case, we will no longer talk about resistance R, but more
generally about impedence Z. This important concept will be taken up and
extended in Chapter 7, relating to the “frequency ...