An introduction to Conventional Current and Direct current. Includes conventional current direction and dimensions. We even talk about the Bohr model of the atom. And, of course, an example problem where we figure out current and the number of elect...rons that pass through the wire. (10:14)
Content Times: (click time to access)
0:18 Definition of Current
1:05 The Dimensions for Current
2:00 Conventional Current (Current Direction)
3:25 Alternating and Direct Current
5:11 Reading the Example Problem
6:44 Solving for Current (part a)
7:53 Solving for Number of Charges (part b)
9:13 How many is 81 Quadrillion Elections?
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Defining Resistance, Ohmic vs. Non-Ohmic and Electric Power[more]

The instructor gives more classroom demonstrations dealing with electric current, voltage, resistance, and Ohm's Law. The classroom is dark because the instructor is using a projector in a darkened room.

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From pbslearningmedia.org, produced by WGBH Educational Foundation

In this interactive resource adapted from the Wisconsin Online Resource Center, learn how a generator produces alternating current. More specifically, see how slip rings, brushes, an armature loop, and a magnetic field interact to produce single-phas...e alternating current. Animations show how positive and negative voltages are induced into the armature loop as it rotates through the magnetic field, and how the polarity of the voltage changes periodically, visualized as a sine wave.[more]

From pbslearningmedia.org, produced by WGBH Educational Foundation

In this interactive simulation adapted from the University of Colorado's Physics Education Technology project, learn about the relationship between electric current, voltage, and resistance. Known as Ohm's law, this relationship can be described by t...he equation V = I x R. In this activity, you can adjust the voltage and resistance in a simple circuit to see how the current changes according to Ohm's law.[more]

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