SnowDay (Extra Credit)

SnowDay (Extra Credit) - MasteringPhysics Assignment Print...

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MasteringPhysics: Assignment Print View Reading Quiz 28.1 Part A What quantity is represented by the symbol ? ANSWER: Resistivity Conductivity Current density Complex impedance Johnston’s constant Introduction to Electric Current Learning Goal: To understand the nature of electric current and the conditions under which it exists. Electric current is defined as the motion of electric charge through a conductor . Conductors are materials that contain movable charged particles. In metals, the most commonly used conductors, such charged particles are electrons. The more electrons that pass through a cross section of a conductor per second, the greater the current. The conventional definition of current is , where is the current in a conductor and is the total charge passing through a cross section of the conductor during the time interval . The motion of free electrons in metals not subjected to an electric field is random : Even though the electrons move fairly rapidly, the net result of such motion is that (i.e., equal numbers of electrons pass through the cross section in opposite directions). However, when an electric field is
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