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98
CHAPTER 17
(b) If the minimum acceptable power delivered to the cleaner is
, then Equations
(2) and (3) give the maximum allowable total resistance as
min
P
()
42
, max
, max
min
1
min
1
2
ti
c
VV
RR
R
∆∆
=+
=
=
PP
so
22 2
, max
11
min
1
min
1
min
1
1
22
2
ci
VV V
∆∆ ∆
=−
525 W
=
2
V
∆
=
1
−
When
, then
min
P
2
, max
120 V
0.128
3
5
525 W
535
c
R
25
W
W
=
−=
Ω
and, from Equation (4),
( )
8
min
4 1.7
10
m
15.0 m

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