1-Resistivity depends on the material the wire is made from and has units of ohm-meters.
2-R∝L
3-3.52
4-32 Ω
5-13.5 mA
6-9:10
Which statement correctly describes the resistivity of a wire?(1 point)
A.) Resistivity depends on the current through the wire and has units of ohms.
B.) Resistivity depends on the material the wire is made from and has units of ohm-meters.
C.) Resistivity depends on the material the wire is made from and has units of ohms.
D.) Resistivity depends on the current through the wire and has units of ohm-meters.
Which representation shows the relationship between resistance and the length of a wire?(1 point)
A.) R∝LR∝L
B.) R∝1LR∝1L
C.) R∝L2R∝L2
D.) R∝1L2
The table shows the resistivity of four different materials.
Material
Resistivity (Ω⋅m)
Aluminum 2.65 x 10–8
Copper 1.68 x 10–8
Silver 1.59 x 10–8
Tungsten 5.60 x 10–8
About how many times greater is the resistance of a tungsten wire than the resistance of a silver wire of the same length and cross-sectional area? (1 point)
A.) 0.28
B.) 3.52
C.) 2.11
D.) 3.33
The resistance of a wire is 8 Ω. What would the resistance be if the length of the wire was increased by a factor of four?(1 point)
A.) 32 Ω
B.) 16 Ω
C.) 2 Ω
D.) 4 Ω
What current is produced with a voltage of 6.0 V and a resistance of 445 ohms?(1 point)
A.) 17.4 mA
B.) 11.0 mA
C.) 15.7 mA
D.) 13.5 mA
Suppose wire X and wire Y are made of different materials, and have different lengths and cross-sectional areas. What is the ratio of the resistance of wire X to the resistance of wire Y?
The length of wire X is one fifth the length of wire Y.
The radius of wire X is one third the radius of wire Y.
The resistivity of the material of wire X is half the resistivity of the material of wire Y.
(1 point)
A.) 9:10
B.) 10:9
C.) 10:3
D.) 3:10
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