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University Physics (Prof. David Flory)
Chapt_27
Sunday, February 03, 2008
Page 1
Name: __________________________
Date: _____________
1.
By using only two resistors,
R
1
and
R
2
, a student is able to obtain resistances of 3
Ω
, 4
Ω
, 12
Ω
, and 16
Ω
. The values of
R
1
and
R
2
(in ohms) are:
A)
3, 4
B)
2, 12
C)
3, 16
D)
4, 12
E)
4, 16
2.
Four 20
Ω
resistors are connected in parallel and the combination is connected to a 20
V emf device. The current in any one of the resistors is:
A)
0.25 A
B)
1.0 A
C)
4.0 A
D)
5.0 A
E)
100 A
3.
In the figure, voltmeter V
1
reads 600 V, voltmeter V
2
reads 580 V, and ammeter A reads
100 A. The power wasted in the transmission line connecting the power house to the
consumer is:
A)
1 kW
B)
2 kW
C)
58 kW
D)
59 kW
E)
60 kW
Write the letter for the correct answer on the answer sheet.
Write clearly.
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View Full Document University Physics (Prof. David Flory)
Chapt_27
Sunday, February 03, 2008
Page 2
4.
A series circuit consists of a battery with internal resistance
r
and an external resistor
R
.
If these two resistances are equal (
r
=
R
) then the thermal energy generated per unit time
by the internal resistance
r
is:
A)
the same as by
R
B)
half that by
R
C)
twice that by
R
D)
onethird that by
R
E)
unknown unless the emf is given
5.
A certain ammeter has an internal resistance of 1
Ω
and a range from 0 to 50 mA. To
make its range from 0 to 5 A, use:
A)
a series resistance of 99
Ω
B)
an extremely large (say 10
6
Ω
) series resistance
C)
a resistance of 99
Ω
in parallel
D)
a resistance of 1/99
Ω
in parallel
E)
a resistance of 1/1000
Ω
in parallel
6.
A 120V power line is protected by a 15A fuse. What is the maximum number of “120
V, 500 W” light bulbs that can be operated at full brightness from this line?
A)
1
B)
2
C)
3
D)
4
E)
5
7.
Two identical batteries, each with an emf of 18 V and an internal resistance of 1
Ω
, are
wired in parallel by connecting their positive terminals together and connecting their
negative terminals together. The combination is then wired across a 4
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This note was uploaded on 11/20/2011 for the course PHYSICS 2 taught by Professor Davidflory during the Spring '11 term at WPUNJ.
 Spring '11
 DavidFlory
 Physics, Resistance

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