Why Some Materials Conduct Electricity and Others Don’t

Electricity flows when electrons can move freely through a material.
Metals like copper and silver conduct well because their outer electrons are loosely held.
Insulators like rubber and glass hold electrons tightly, blocking electric flow.
Semiconductors, like silicon, sit in between—sometimes conducting, sometimes resisting.
Conductivity depends on a material’s atomic structure and how electrons are arranged.
Temperature affects conductivity—metals conduct less when hot, while semiconductors conduct more.
Impurities added to semiconductors (a process called doping) fine-tune their conductivity.
This control of conductivity is the foundation of modern electronics and computers.
Water conducts electricity only when it has dissolved ions like salt.
From power lines to phone chips, conductivity explains why materials power our world differently.