Introduction
The Fundamental Concepts
Current
Voltage
Power
Resistance
Relationships & Laws
Energy
The Circuits
Conclusion
 RESISTANCE - THE PHYSICAL PROPERTIES OF RESISTANCE

The magnitude of resistance is determined in part by the "number of free electrons" available within the material.

Since a decrease in the number of free electrons will decrease the current flow, it can be said that the opposition to current flow (resistance) is greater in a material with fewer free electrons. Thus, the resistance of a material is determined by the number of free electrons available in a material.

A knowledge of the conditions that limit current flow and, therefore, affect resistance can now be used to consider how the type of material, physical dimensions, and temperature will affect the resistance of a conductor.

Resistance - The Physical Properties of Resistance
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