Quick Answer
Room-temperature superconducting metals would remove electrical resistance in those materials under the assumed conditions. Power transmission could become far more efficient, powerful magnets could become easier to build, and some technologies could shrink dramatically. The transition would still be constrained by cooling, magnetic fields, material strength and the fact that not every electrical component is simply a metal wire.
Superconductivity is characterized by zero electrical resistance and other quantum effects. Making it ordinary at room temperature would remove one of the biggest engineering barriers to widespread superconducting technology.
Power grids change
Transmission lines made from suitable superconducting materials could carry current with far lower resistive losses. Grid design could become more compact, although converting existing infrastructure would be enormous.
Magnets become easier
Superconducting coils can generate strong magnetic fields efficiently. MRI systems, research magnets and motors could benefit if the materials also tolerated the required currents and fields.
Electronics are not solved automatically
Many electronic devices need controlled resistance, semiconductor junctions and switching behavior. Turning all metals superconducting would not magically replace semiconductors.
Mechanical properties still matter
A metal can conduct perfectly and still be weak, brittle or difficult to manufacture. Superconductivity solves an electrical problem, not every materials-engineering problem.
SpeculativeReal superconductors have critical temperatures, currents and magnetic fields. The thought experiment assumes those constraints are somehow removed or moved far beyond ordinary conditions.
The bottom line
Room-temperature superconducting metals would be a technological revolution, especially for power and magnets, but they would not make every electrical device obsolete.
A note on our approach: Every article on WhatIfLab separates what current science establishes from what remains genuinely speculative. Where we cite a figure or finding, it reflects published, mainstream research at the time of writing — not a prediction dressed up as fact.