RESISTANCE IN WIRES
NAME:____________________
1. A copper wire of length L and cross-sectional area A has
resistance R. A second copper wire at the same temperature
has a length of 2L and a cross-sectional area of 12A. What is
the resistance of the second copper wire?
1) R
2) 2R
3) 1 R
2
4) 4R
2. If the length of a copper wire is reduced by half, then the
resistance of the wire will be
1) halved
3) quartered
2) doubled
4) quadrupled
3. A uniform copper wire has a resistance of 100 ohms. If the
wire is cut into 10 equal lengths, the resistance of each
piece will be
1) 1 Ω
3) 100 Ω
2) 10 Ω
4) 1,000 Ω
4. The graph below shows the relationship between the potential difference across a metallic conductor and the electric current through the
conductor at constant temperature T1.
Which graph best represents the relationship between potential difference and current for the same conductor maintained at a higher
constant temperature, T2?
1)
3)
2)
4)
5. As the temperature of a metal conductor is reduced, the
resistance of the conductor will
1) decrease
3) remain the same
2) increase
6. The diagram below represents a lamp, a 10-volt battery, and
a length of nichrome wire connected in series.
10. If the diameter of a wire were decreased, its electrical
resistance would
1) decrease
3) remain the same
2) increase
11. Plastic insulation surrounds a wire having diameter d and
length … as shown below.
As the temperature of the nichrome is decreased, the
brightness of the lamp will
1) decrease
3) remain the same
2) increase
7. To reduce the resistance of a metal conductor one should
1) cool the conductor to a low temperature
2) heat the conductor to a high temperature
3) coat the conductor with an insulator
4) wire the conductor in series with another resistor
8. As the temperature of a coil of copper wire increases, its
electrical resistance
1) decreases
3) remains the same
2) increases
9. The diagram below shows a circuit in which a copper wire
connects points A and B.
The electrical resistance between points A and B can be
decreased by
1) replacing the wire with a thicker copper wire of the
same length
2) replacing the wire with a longer copper wire of the
same thickness
3) increasing the temperature of the copper wire
4) increasing the potential difference supplied by the
battery
A decrease in the resistance of the wire would be produced
by an increase in the
1) thickness of the plastic insolation
2) length of the wire
3) diameter d of the wire
4) temperature of the wire
12. Two copper wires have the same length, but the crosssectional area of wire A is twice that of wire B. Compared
to the resistance of wire B. the resistance of wire A is
1) one-quarter as great
3) twice as great
2) one-half as great
4) four times as great
13. A 12.0-meter length of copper wire has a resistance of 1.50
ohms. How long must an aluminum wire with the same
cross-sectional area be to have the same resistance?
1) 7.32 m
3) 12.0 m
2) 8.00 m
4) 19.7 m
14. What is the resistance at 20°C of a 1.50-meter-long
aluminum conductor that has a cross-sectional area of
1.13 × 10–6 meter2?
1) 1.87 × 10–3 Þ
2) 2.28 × 10–2 Þ
3) 3.74 × 10–2 Þ
4) 1.33 × 106 Þ
15. A 10.-meter length of wire with a cross-sectional area of 3.0
× 10–6 square meter has a resistance of 9.4 × 10–2 ohm at
20° Celsius. The wire is most likely made of
1) silver
3) aluminum
2) copper
4) tungsten
16. A 0.500-meter length of wire with a cross-sectional area of
3.14 × 10–6 meters squared is found to have a resistance of
2.53 × 10–3 ohms. According to the resistivity chart, the
wire could be made of
1) aluminum
3) nichrome
2) copper
4) silver
17. The graph below represents the relationship between
potential difference and current for four different resistors.
Which resistor has the greatest resistance?
19. In the diagrams below, l represents a unit length of copper
wire and A represents a unit cross-sectional area. Which
copper wire has the smallest resistance at room
temperature?
1)
2)
3)
1)
2)
A
B
3)
4)
C
D
18. A student needs to increase the resistance in a circuit. All
that is available for this task is a wide variety of wires of
different lengths and thicknesses. To obtain the maximum
resistance, the student should replace the wire with one that
is
1) shortest and thickest
3) longest and thickest
2) shortest and thinnest
4) longest and thinnest
4)
20. What is the resistance at 20.ºC of a 2.0-meter length of
tungsten wire with a cross-sectional area of
7.9 × 10–7 meter2?
1) 5.7 × 10–1 Þ
2) 1.4 × 10–1 Þ
3) 7.1 × 10–2 Þ
4) 4.0 × 10–2 Þ
21. A metal wire has length L and cross-sectional area A. The
resistance of the wire is directly proportional to
1) L
A
2) L × A
3) A
L
4) L + A
22. Aluminum, copper, gold, and nichrome wires of equal
lengths of 1.0 × 10–1 meter and equal cross-sectional areas
of 2.5 × 10–6 meter2 are at 20. °C. Which wire has the
greatest electrical resistance?
1) aluminum
3) gold
2) copper
4) nichrome
RESISTANCE IN WIRES
NAME:____________________
Reference Tables
RESISTANCE IN WIRES
NAME:____________________
Reference Tables
Answer Key
[New Exam]
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4
2.
1
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