Electric Current and Resistance Quiz
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Questions and Answers

What is the formula for electrical resistance?

  • R = A/ρl
  • R = ρlA
  • R = ρl/A (correct)
  • R = A/ρl

    • What is the relationship between electric current and potential difference according to Ohm's law?

  • They are directly proportional, with temperature and mechanical strain remaining constant (correct)
  • They are inversely proportional, with temperature and mechanical strain affecting the relationship
  • They are directly proportional, with temperature and mechanical strain affecting the relationship
  • They are inversely proportional, with temperature and mechanical strain remaining constant

    • What is the relationship between conductance and resistivity?

  • G = A/ρl
  • G = 1/ρlA
  • G = ρlA
  • G = ρl/A (correct)

    • What is the definition of electrical conductivity?

    <p>It is the reciprocal of resistivity, denoted by σ</p> Signup and view all the answers

    What is the motion of electrons due to thermal energy?

    <p>Continuous random motion with change in direction at each collision</p> Signup and view all the answers

    What is the relationship between electrical resistance and resistivity?

    <p>They are directly proportional</p> Signup and view all the answers

    What is the relationship between electrical conductivity and resistivity?

    <p>They are inversely proportional</p> Signup and view all the answers

    What is the relationship between electric current and potential difference according to Ohm's law?

    <p>They are directly proportional</p> Signup and view all the answers

    What is the relationship between conductance and resistance?

    <p>They are inversely proportional</p> Signup and view all the answers

    What is the effect of temperature on electric current according to Ohm's law?

    <p>It remains constant</p> Signup and view all the answers

    Study Notes

    • The formula for electrical resistance is R = ρ × L / A, where R is the resistance, ρ is the resistivity, L is the length, and A is the cross-sectional area of the conductor.
    • According to Ohm's law, the electric current (I) is directly proportional to the potential difference (V) and inversely proportional to the resistance (R), expressed as I = V / R or V = I × R.
    • Conductance (G) is the reciprocal of resistance (R), i.e., G = 1 / R.
    • Resistivity (ρ) is inversely proportional to conductance (G), i.e., ρ = 1 / G.
    • Electrical conductivity (σ) is the reciprocal of resistivity (ρ), i.e., σ = 1 / ρ.
    • The motion of electrons due to thermal energy is known as thermal agitation or random motion.
    • Electrical resistance (R) is directly proportional to resistivity (ρ) and length (L) of the conductor, and inversely proportional to its cross-sectional area (A), i.e., R = ρ × L / A.
    • Electrical conductivity (σ) is inversely proportional to resistivity (ρ), i.e., σ = 1 / ρ.
    • There is no effect of temperature on electric current according to Ohm's law, as it is a linear relationship between voltage and current.

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    Description

    Test your knowledge of electric current, Ohm's Law, and electrical resistance with this quiz. Explore the relationship between electric current, potential difference, and resistance in conducting materials.

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