P28_020.PDF

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Chapter 28 - 28.20
20. We note that two resistors in parallel, say R 1 and R 2 ,areequivalentto
R parallel pair =
1
=
R 1 R 2
R 1 + R 2
.
1
R 1 +
1
R 2
This situation (Figure 28-27) consists of a parallel pair which are then in series with a single 2 . 50 Ω
resistor. Thus, the situation has an equivalent resistance of
R eq =2 . 50 Ω + (4 . 00 Ω)(4 . 00 Ω)
4 . 00 Ω + 4 . 00 Ω =4 . 50 Ω .
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