DC Circuits, Part 2: Encountering Resistance

Posted by: AK Tutoring  /   Category: Physics   /   No Comments
29
Dec
2015

In Part 1, we learned about the conventions used to describe direct current flowing through a circuit, and the batteries used to drive that current. In Part 2, we're investigating resistance. Resistance inhibits the flow of charge in a circuit by converting electrical energy to heat; resistors are the devices that provide resistance..

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Forcing the Issue

Posted by: AK Tutoring  /   Category: Physics   /   No Comments
26
Dec
2015

Occasionally, I find myself ruminating on Newton's Third Law. (A totally normal occurrence, I'm sure.) Every time I teach Newton's laws of motion, my heart rate goes up a bit as we count up to the Third Law, which seems so subtle and confusing after the ease of the first two laws, as I see.

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DC Circuits, Part 1: Establishing Conventions

Posted by: AK Tutoring  /   Category: Physics   /   No Comments
20
Mar
2015

An electric current is made of moving charged objects. You've probably already seen a very simple diagram of a voltage- (or EMF-) driven current flowing through metallic conducting wire: In such cases, electrons within the metal's atoms are free to move and flow from the negative terminal to the positive terminal: Despite the actual flow.

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Movement and Electromagnetism, Part 2: Changing Magnetic Field-Induced Currents

Posted by: AK Tutoring  /   Category: Physics   /   No Comments
28
Sep
2014

Last time, we saw how steadily moving charges in a current induce a magnetic field.  This assumed that current was already present.  On the other hand, even if no current is flowing through a straight or coiled wire, we can create a current through the movement or change of a magnetic field.  This may be.

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