CURRENT

    Cards (22)

    • It is any movement of charges from one region to another is called what?

      Current
    • The ________ _______ is defined as the net charge flowing through an area per unit time.
      electric current
    • What is the direction of the current if it flows of positive charges?
      Same
    • What is the direction of the current if it flows of negative charges?
      Opposite
    • What is the SI unit of electric current
      C/s or A
    • It is the limit if the average current as the time interval approaches zero.
      Instanteneous current
    • Charges flowing through a surface can be ________, ________, or ____.
      positive, negative, both
    • All currents are simply what?
      The averages of the charge passing through an area over time
    • In plasma, these charges may include both _________ and __________________ ions.
      positively-, negatively-charged
    • The direction of the current is the same as the flow of positive charges.
      Conventional current
    • The direction of current is opposite as the flow of negative charges.
      Electron flow
    • The electric field is ____ in a conductor.
      zero
    • Since the motion of these electrons is ______, there is __ ___ ____ __ ______ in any specific direction; hence there is __ ______.
      random, no net flow of charge, no current
    • A charged particle also moves ________ and experiences frequent __________ with __________ ions within the conductor.
      randomly, collisions, stationary
    • What is the very slow net motion or drift of the moving charges in the direction of the steady electric force?

      drift velocity
    • Why does there are no absolute value signs in the equation?

      Because the sign of q affects the direction of the drift velocity
    • If q is positive, vd moves in the ____ direction as E.
      same
    • If q is negative, vd then is in the ________ direction of E.
      opposite
    • In both cases, the direction of J is _______ to the direction of E.
      similar
    • In cases where there are different kinds of moving charges, concentrations, and magnitudes of drift velocities involved, how can we determine the total current for each charged particle?
      Using superposition principle
    • It has an SI unit of coulomb per second (C/s) or the ampere (A).
      Electric current
    • It is the current per unit cross-sectional area. It has a unit of amperes per square meter (A/m2).
      Current density
    See similar decks