Length and cross sectional area

Low resistance and thermal heat

Temperature and electrical hazards

Insulation resistance and dielectric strength

Square metal disk

Circular metal disk

Cylindrical glass disk

Rectangular plastic disk

Wire resistance

Passing current

Conductor s shape

Conductor s diameter

Q / V

I x R

V / I

I / V

Gallium and indium

Silver and aluminium

Arsenic and antimony

Silicon and germanium