Exam (elaborations)
PHYS 205 - CH.27 TEST BANK QUESTIONS AND ANSWERS CONCORDIA UNIVERSITY
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- Concordia University ( )
PHYS 205 - CH.27 TEST BANK QUESTIONS AND ANSWERS CONCORDIA UNIVERSITY
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PHYS 205 - CH.27 TEST BANK QUESTIONS AND ANSWERSCONCORDIA UNIVERSITY
MULTIPLE CHOICE
1. A rod of 2.0-m length and a square (2.0 mm 2.0 mm) cross section is made of a material
with a resistivity of 6.0 10 8 m. If a potential difference of 0.50 V is placed across the
ends of the rod, atwhat rate is heat generated in the rod?
a. 3.0 W
b. 5.3 W
c. 8.3 W
d. 1.3 W
e. 17 W
ANS: C PTS: 2 DIF: Average
2. An electric device, which heats water by immersing a resistance wire in the water,
generates 50 cal ofheat per second when an electric potential difference of 12 V is placed
across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)
a. 0.94
b. 0.81
c. 0.58
d. 0.69
e. 1.5
ANS: D PTS: 2 DIF: Average
3. A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves)
the lightbulb in 1.0 min?
a. 17 C
b. 15 C
c. 14 C
d. 13 C
e. 60 C
ANS: B PTS: 2 DIF: Average
4. What maximum power can be generated from an 18-V emf using any combination of a 6.0-
resistorand a 9.0- resistor?
a. 54 W
b. 71 W
c. 90 W
d. 80 W
e. 22 W
ANS: C PTS: 2 DIF: Average
5. An electric heater is constructed by applying a potential difference of 110 V across a
wire with aresistance of 5.0 . What is the power rating of the heater?
a. 2.0 kW
b. 2.4 kW
c. 1.7 kW
d. 1.5 kW
, e. 60 kW
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