Demonstration: the spark through the air from a discharging Van de Graaff is bluish in colour, just like a more powerful...
Demonstration: a slice of germanium conducts when heated.
Demonstration: these two materials show contrasting effects when heated.
Class practical: the conductivity of a wire decreases as it is heated.
The electrical conductivity of a material is an intrinsic, bulk property that, together with the spatial dimensions and shape...
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