Electrical Engineering: Material Properties
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Questions and Answers

Which of the following materials would be classified as a nonconductor?

  • Copper
  • Silicon
  • Polyethylene (correct)
  • Aluminum

    • At what temperature is the conductivity of superconductors typically measured?

  • Low temperatures (correct)
  • Room temperature
  • Extremely high temperatures
  • High temperatures

    • What is the conductivity of superconductors at low temperatures?

  • $10^{10}$ S/cm
  • $10^{-10}$ S/cm
  • $10^{-20}$ S/cm
  • $10^{20}$ S/cm (correct)

    • What is the largest known variation in a physical property, as mentioned in the text?

    <p>40 orders of magnitude</p> Signup and view all the answers

    What is the ratio between the diameter of the universe and the radius of an electron, as mentioned in the text?

    <p>$10^{26} : 10^{-14}$</p> Signup and view all the answers

    What is the relationship between resistivity (ρ), conductivity (𝜎), and their inverse values?

    <p>Resistivity is equal to the inverse of conductivity (ρ=1/𝜎)</p> Signup and view all the answers

    According to Ohm's law, what is the relationship between resistance (R), length (L), and cross-sectional area (A)?

    <p>Resistance is directly proportional to length and inversely proportional to cross-sectional area (R∝L/A)</p> Signup and view all the answers

    What unit is commonly used for length in engineering when measuring resistance?

    <p>Centimeter</p> Signup and view all the answers

    What does the electric field strength (ζ) represent in the context of electric circuits?

    <p>Electric potential</p> Signup and view all the answers

    Which type of materials are divided into conductors, semiconductors, and nonconductors?

    <p>Metals</p> Signup and view all the answers

    What is the principal characteristic used to classify materials?

    <p>Ability to conduct electrical current</p> Signup and view all the answers

    At what temperature is the conductivity of superconductors typically measured?

    <p>Low temperatures</p> Signup and view all the answers

    What is the largest known variation in a physical property, as mentioned in the text?

    <p>25 orders of magnitude</p> Signup and view all the answers

    Which materials are often called insulators or dielectrics due to their lack of ability to conduct electrical current?

    <p>Nonconductors</p> Signup and view all the answers

    What is the reciprocal of the ohm defined to be?

    <p>1 siemens</p> Signup and view all the answers

    What relationship does the resistance (R) have with the length (L) and cross-sectional area (A)?

    <p>R= L.ρ/A</p> Signup and view all the answers

    Who empirically found the relationship in Ohm's law?

    <p>Georg Simon Ohm</p> Signup and view all the answers

    What is the relationship between current density (j), conductivity (σ), and the cross-sectional area (A)?

    <p>j = σ / A</p> Signup and view all the answers

    What is the unit of conductivity (σ) in the context of electric circuits?

    <p>S/cm</p> Signup and view all the answers

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