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Material World
Application

Electrical conduction

Carrying electric current with minimal loss.

Conductor choice is rarely decided by conductivity alone. Silver conducts best, copper is close behind and vastly cheaper, and aluminium conducts less well per unit volume but far better per unit mass — which is why overhead transmission lines are aluminium and building wiring is copper. The right answer depends on whether cost, volume or weight is the binding constraint.

Medium confidence Weak evidence checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

uses

  • Copper — element
  • Aluminium — element
  • Graphite — mineral
  • Tantalum — element · as a capacitor dielectric substrate, not as a conductor
  • Polyethylene — material · as insulation around the conductor, not as the conductor
  • Caesium — element · as a photocathode, exploiting the lowest ionisation energy of any stable element
  • Muscovite — mineral · as the insulator around a conductor rather than as a conductor — it withstands heat that would destroy polymer insulation
  • Nichrome — alloy · as a deliberately poor one: nichrome is chosen for its resistance, not despite it
  • Solder — alloy · every joint in every electronic device, where the requirement is to melt low rather than to conduct well
  • Silicone rubber — material · as insulation rather than conduction — silicone's surface behaviour in rain and pollution is what displaced ceramic from high-voltage line insulators

Sources

  • Material World
    Our own writing

Questions this page answers

Where it comes from, and what it becomes

Follow Electrical conduction back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Upstream — what it comes from

  • Electrical conduction → uses → Copper → is produced by (as blister copper, refined electrolytically afterwards) → Smelting → takes as input (as the element removed, not added) → Oxygen → is produced by (the largest output by tonnage, and the reason air separation units sit beside steelworks) → Air separation → takes as input (the feedstock, and an unusual one in being free, unlimited and available anywhere — the cost is entirely the energy to liquefy it) → Air
  • Electrical conduction → uses → Aluminium → is extracted from (via alumina — bauxite is refined by the Bayer process before smelting) → Bauxite → is sourced from (the residue of prolonged tropical weathering, which strips the silica and alkalis out of an aluminosilicate rock and leaves the aluminium behind — basalt is one common parent among several) → Basalt → is sourced from (partial melting of mantle peridotite is what basalt magma is — the residue left behind stays peridotite, depleted of what went into the melt) → Peridotite → is composed of (the mineral that defines the rock and gives it its name — a peridotite is olivine-dominant by definition) → Olivine
  • Electrical conduction → uses (as insulation around the conductor, not as the conductor) → Polyethylene → is produced by (from ethylene; chain length and branching decide whether it is a milk bottle or a fibre) → Polymerisation → takes as input (as vinyl chloride, which is why more than half of PVC's weight is salt rather than oil) → Chlorine → is produced by (at the anode) → Chlor-alkali electrolysis → takes as input (as brine; the salt is the feedstock for both products at once) → Halite
  • Electrical conduction → uses (as a photocathode, exploiting the lowest ionisation energy of any stable element) → Caesium → is produced by (calcium or barium reducing caesium chloride under vacuum — caesium is too reactive to survive most alternatives) → Metallothermic reduction → takes as input (the cheapest reducing metal and the commonest, and the aluminium in thermite) → Aluminium → is extracted from (via alumina — bauxite is refined by the Bayer process before smelting) → Bauxite → is sourced from (the residue of prolonged tropical weathering, which strips the silica and alkalis out of an aluminosilicate rock and leaves the aluminium behind — basalt is one common parent among several) → Basalt
  • Electrical conduction → uses (as a deliberately poor one: nichrome is chosen for its resistance, not despite it) → Nichrome → is composed of (the whole point: it forms the tight oxide skin that stops the wire burning away at red heat, and re-forms if it is damaged) → Chromium → is produced by (as ferrochrome, reduced from chromite and added to steel without ever being separated as the pure metal) → Smelting → takes as input (as the element removed, not added) → Oxygen → is produced by (the largest output by tonnage, and the reason air separation units sit beside steelworks) → Air separation
  • Electrical conduction → uses (every joint in every electronic device, where the requirement is to melt low rather than to conduct well) → Solder → is composed of (under a per cent, to slow the rate at which the joint dissolves the copper it is sitting on) → Copper → is produced by (as blister copper, refined electrolytically afterwards) → Smelting → takes as input (as the element removed, not added) → Oxygen → is produced by (the largest output by tonnage, and the reason air separation units sit beside steelworks) → Air separation

These are the most distinct paths back. Electrical conduction can be traced through others besides.