The amount that a material can conduct electricity depends on its resistivity. Resistivity can be demonstrated by taking a cube of material below and altering its size and shape.

Questions on resisitivity appear in the 2330-202, 2330-301 and the 2357-309 exams.

Example showing a cube of conductive material


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Where would self inductance be used?

Within a standard fluorescent light fitting, we commonly use what is knows as a "choke" or "ballast" to limit the current flow to the lamp. In effect, it is self inductance that achieves this.

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