a) resistivity

0.0(0)
studied byStudied by 0 people
0.0(0)
linked notesView linked note
full-widthCall Kai
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/5

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

6 Terms

1
New cards

  • describe the difference between resistance and resistivity

  • resistance = the specific current oppositions of specific components

  • resistivity = an electrical property of specific materials

2
New cards

  • what is the resistance of a wire affected by?

  • the material of the wire

  • the temperature of the wire

  • the length of the wire

  • the cross-sectional area of the wire

3
New cards

  • describe how the temperature of a wire affects its resistance

  • high temperature

  • more kinetic energy

  • larger vibrations

  • more collisions

  • higher resistance

4
New cards

  • describe how the length of a wire affects its resistance

  • longer wire

  • more positive ions

  • more collisions

  • higher resistance

5
New cards

  • describe how the cross-sectional area of a wire affects its resistance

  • larger cross-sectional area

  • more pathways for electrons to travel through

  • lower resistance

6
New cards

  • describe how to derive the formula for resistivity from resistance

  • resistance = directly proportional to the length of the wire

    • R ∝ L

  • resistance = inversely proportional to the cross-sectional area of the wire

    • R ∝ 1 / A

  • therefore

    • R = L / A

    • R = (ρL) / A

    • ρ = (RA) / L

    • resistivity (Ωm) = (resistance (Ω) x cross-sectional area (A)) / length (m)