
4.2.2 Electrical Resistance
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•
Physics
•
10th - 12th Grade
•
Hard
Standards-aligned
David Bittinger
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3 Slides • 7 Questions
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4.2.2 Electrical Resistance
by David Bittinger
2
•resistance: OPPOSITION TO CURRENT
•unit: Ohm (Ω)
•factors that change resistance:
•resistivity: MATERIAL
•length
•cross-sectional area
•temperature
3
Jump to slide 3 &4 of ppt.
Hallway analogy
4
Multiple Choice
Which material has the lowest resistivity?
Gold
Tungsten
Nichrome
Aluminum
5
Multiple Choice
Which material is the best conductor of electricity?
Gold
Tungsten
Nichrome
Aluminum
6
Multiple Choice
Determine the resistance of a 1.0 meter long copper wire with a cross-sectional area of 0.01 m^2
10,000 Ω
100 Ω
1.72E-4 Ω
1.72E-6 Ω
7
Multiple Choice
A piece of wire that has a length of 5.0E7 meters and a cross-sectional area of 0.025 m^2 has a resistance of 31.8 ohms
1.59E-8 Ωm
3.975E-10 Ωm
0.159 Ωm
0.0199 Ωm
8
Multiple Choice
Which change decreases the resistance of a piece of copper wire?
Increasing the wire's length
Increasing the wire's resistivity
Decreasing the wires temperature
Decreasing the wire's diameter
9
Multiple Choice
What is the resistance of a 20.0 meter long tungsten rod with a cross-sectional area of 1.00E-4 m^2 at 20 degrees Celsius?
2.80E-5 Ω
1.12E-2 Ω
89.3 Ω
112 Ω
10
Multiple Choice
The diagrams represent four pieces of copper wire ate 20 degrees Celsius. For each piece of wire, l represents a unit of length and A represents a unit of cross-sectional area. The piece of wire that has the greatest resistance is
wire 1
wire 2
wire 3
wire 4
4.2.2 Electrical Resistance
by David Bittinger
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