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Conductors, Capacitors and Dielectrics

Topic Review on "Title":

Conductor:
Material where electrons are loosely bound and are able to flow throughout due to the free electrons. 

Insulator:
Materials where electrons are bound and don’t flow easily. 

Semiconductor:
Materials in between insulator and conductor.

Superconductor:
A material where electrons flow without any resistance.  Generally, superconductivity only occurs at very low temperatures. 

Resistivity:
An intrinsic property of a material that partially determines the resistance of a wire.

Capacitor:
A device used to store or accumulate electric energy.  This is done by oppositely charging two nearby conductive surfaces that are not in contact with each other.

Dielectric:
An insulating material is inserted between the plates of a capacitor. 

Dielectric Constant:
The factor that describes the additional capacitance gained by adding a dielectric material between the plates of a capacitor.


Rapid Study Kit for "Title":
Flash Movie Flash Game Flash Card
Core Concept Tutorial Problem Solving Drill Review Cheat Sheet

"Title" Tutorial Summary :

Materials may conductor charge flow, resist charge flow, or some variation between those two.  The resistance of a piece of wire depends upon several factors: the type of material, the length of wire, the cross section of wire, and the temperature of the wire.
Capacitors are oppositely charged sections of conductors held near each other.  Although they have a net charge, they store energy due to the proximity of the oppositely charged plates.  The strength or capacitance of a capacitor depends on the area of the plates, the distance between them, and a constant.  This capacitance could also be increased by adding an insulating material between the plates.  This is called a dielectric.


Tutorial Features:

Specific Tutorial Features:
• Animated diagram of a capacitor charging and discharging.
• Problem-solving techniques are used to work out and illustrate the example problems, step by step.

Series Features:
• Concept map showing inter-connections of new concepts in this tutorial and those previously introduced.
• Definition slides introduce terms as they are needed.
• Visual representation of concepts
• Animated examples—worked out step by step
• A concise summary is given at the conclusion of the tutorial.


"Title" Topic List:

Conductors

Conductors
Insulator
Semiconductors
Superconductors
Resistance of a piece of wire

Capacitors

Definition
Units
Diagram
Charge stored in a capacitor

Dielectrics

Polarization
Dielectric constant



See all 24 lessons in College Physics, including concept tutorials, problem drills and cheat sheets:
Teach Yourself College Physics Visually in 24 Hours

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