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1.4 Voltage
and CLr
ent
11
describe
the
interconnection
with mathematical
equation$ For the mathe
matical equations
to be useful,we must write them
in terms of measurable
quantities.In
the case of circuits.
these quantities are voltage and current,
whjch we discuss
in Section 1.4. The study of circuit analysis
involves
understanding
the behavior of each
ideal circuit element
in terms of its
voltage and current and understanding
the constraints
imposed on the
voltage and current as a result of interconnccting
the
ideal elcmcnts
1.4 Vottage
and Current
The concept
of electric charge
is the basis
for describing
all electrical
phe
nomena.
Let's review some
important characteristics
of electric
charge.
.
The charge is bipolar, meaDing
that electrical effects are described
in
terms of positive and negative
charges.
.
The electric charge exists
in discrete quanrities, which are integral
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 Spring '07
 Boser

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