Electrical Conductors, Semi-Conductors, and Insulators (Grade 10 NSC Matric Physical Sciences): Flashcards
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Electrical conductors
Electrical conductors
Materials that allow electrical current to pass through them easily
Insulators
Insulators
Materials that do not allow electrical current to flow through them
Semi-conductors
Semi-conductors
Materials that act as insulators when cold, conductors when heated
Why metals conduct electricity
Why metals conduct electricity
They have a 'sea of electrons' that can move freely between atoms
Most widely used electrical conductor
Most widely used electrical conductor
Copper
Best electrical conductor (but too expensive for everyday use)
Best electrical conductor (but too expensive for everyday use)
Silver
Conductor used in power transmission lines
Conductor used in power transmission lines
Aluminium (lighter than copper)
Two important semi-conductor elements
Two important semi-conductor elements
Silicon (Si) and Germanium (Ge)
General rule for conductivity
General rule for conductivity
Metals conduct electricity, non-metals are insulators
Non-metal that conducts electricity (exception to rule)
Non-metal that conducts electricity (exception to rule)
Graphite (a form of carbon)