Current and Resistance
85
17.39
The resistance per unit length of the cable is
()
2
5
2
2
2.00 W m
2.22
10
m
300 A
IL
R
LL I
−
===
=×Ω
PP
From
RL
A
ρ
=
, the resistance per unit length is also given by
A
=
. Hence, the
crosssectional area is
2
rA
π
==
, and the required radius is
8
5
1.7
10
m
0.016 m
1.6 cm
2.22
10
m
−
×Ω
⋅
=
=
r
17.40
(a) The power input to the motor is
( ) ( )( )
120 V
1.75 A
210 W
0.210 kW
input
VI
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 Spring '09
 Physics, Current, Resistance, Work, International System of Units, 50 Cent, kw, Pinput, kW hp

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