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6 Chapter 25: Capacitance
This chapter and the next one are basically a build up to chapter 27 where we will talk about
the basic physics of electronics/circuits. The two build up chapters will focus on the individual
components of circuits, such as capacitors and resistors, and chapter 27 will allow us put everything
together and analyze how circuits work as a whole.
6.1 Capacitance
Conductors are the main constituent of electronic circuits and so we will seek to ﬁnd new ways of
talking about them in this chapter. When we put two conductors of equal and opposite charge
near each other, we know from the last two chapter that there will be an electric ﬁeld and hence a
potential diﬀerence between them. It turns out that the relationship between the amount of (equal
and opposite) charge placed on the two conductors is linear, by which we mean that the amount
of charge is related to the potential by a constant. This constant of proportionality is what we call
capacitance.
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 Spring '08
 Any
 Physics, Electronics, Capacitance

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