wright (daw2557) – Chapter 26 – de – (14443)
1
This printout should have 6 questions.
Multiplechoice questions may continue on
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beFore answering.
001
10.0 points
A typical color television draws about 2
.
8 A
when connected to a 102 V source.
What is the e±ective resistance oF the T.V.
set?
Correct answer: 36
.
4286 Ω.
Explanation:
Let :
I
= 2
.
8 A
and
V
= 102 V
.
The resistance is
R
=
V
I
=
102 V
2
.
8 A
=
36
.
4286 Ω
.
002
10.0 points
A conductor with crosssectional area 4 cm
2
carries a current oF 15 A.
IF the concentration oF Free electrons in the
conductor is 8
×
10
28
electrons
/
m
3
, what is
the driFt velocity oF the electrons?
Correct answer: 0
.
00292571 mm
/
s.
Explanation:
Let :
I
= 15 A
,
n
= 8
×
10
28
electrons
/
m
3
,
q
e
= 1
.
60218
×
10

19
C
,
and
A
= 4 cm
2
= 0
.
0004 m
2
.
The current in a conductor is given by
I
=
n q v
d
A ,
where
n
is the number oF charge carriers per
unit volume,
q
is the charge per carrier,
v
d
is
the driFt velocity oF the carriers and
A
is the
cross section oF the conduction.
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 Spring '09
 SURESHSHARMA
 Physics, Potential Energy, Correct Answer, Electric power transmission, Wright

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