BRAINCAKEConductors and Semi-Conductors
Materials can be classified into three groups according to their electrical properties.
The number density of free electrons is the number of electrons per unit volume of material. The three groups of materials are:
Conductors. These have a very high number density in the order about 1028m-2
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Key terms in this lesson
- density
- The mass per unit volume of a substance.
- resistance
- The ratio of the potential difference across a component to the current through it.
More in Electricity
- Electric Current
- Millikan's Oil Drop Experiment
- The Flow of Charge in Metals and Electrolytes
- Kirchoff's First Law and Conservation of Charge
- Current and Drift Velocity
- Potential Difference
- Electromotive Force
- The Electron Gun
All 30 lessons in Electricity · All OCR AS-level Physics topics