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38
Circuit
Etemenis
which represents the severth independent equation needed to find the
seven unknown circuit variables mentioned earlier'
The thought of having to solve seven simultaneous equations to find
the curent delivered by a pair oI dry cells to a flashlight lamp is not very
appealing. Thus in the coming chapte$ we introduce
you to analytical
techniques that will enable you to solve a simple oneloop circuit by writ
ing a single equation. However, before moving on to a discussion of these
circuit techniques, we need to make several observations about the
aletailed analysis of the flashlight circuit ln general,
these observations are
true and therefore are important to the discussions
in subsequent chap
ters. They also suppo
the contention that the flashlight circuit can be
solved by defining a single unknown
Firsi, note that if you know tlte curent ill a resistor, you also know the
voltage across the resistor, because current and voltage are directly
relatod through Ohm's law. Thus you can associate one unknown variable
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 Spring '07
 Boser

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