Current Electricity Basics Quiz
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Questions and Answers

Which of the following is a property of current electricity?

  • Its flow is independent of voltage
  • It cannot be used to power electronic devices
  • It is the flow of electric charge through a conductor (correct)
  • It only flows through insulators

    • What is the SI unit of electric current?

  • Ohm
  • Volt
  • Ampere (correct)
  • Watt

    • In which direction does conventional current flow?

  • From positive to negative (correct)
  • It can flow in both directions
  • It does not follow a specific direction
  • From negative to positive

    • What is the formula for calculating current density?

    <p>J = I/A</p> Signup and view all the answers

    How does an increase in cross-sectional area affect the current density?

    <p>An increase in cross-sectional area decreases the current density.</p> Signup and view all the answers

    Explain how current density is different from current?

    <p>Current density is the amount of current flowing through a unit area, while current is the flow of electric charge per unit time.</p> Signup and view all the answers

    What is the definition of current density?

    <p>The amount of charge per unit time that flows through a unit area of a chosen cross section.</p> Signup and view all the answers

    How is the current density vector defined?

    <p>As a vector whose magnitude is the electric current per cross-sectional area at a given point in space, with its direction being that of the motion of the positive charges at that point.</p> Signup and view all the answers

    What are the SI base units for measuring electric current density?

    <p>Amperes per square metre.</p> Signup and view all the answers

    How is the electric current density at a given point M calculated?

    <p>It is given by the limit of the electric current flowing through a small surface A centered at M and orthogonal to the motion of the charges at M.</p> Signup and view all the answers

    What is the relationship between charge density, velocity of charges, and electric current density?

    <p>The charge contained in the volume formed by the velocity and an infinitesimal surface will flow through that surface, and is given by the equation dq = ρ v dt dA.</p> Signup and view all the answers

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