9.4 conductors and insulators Flashcards

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1
Q

name 5 electrical conductors and 5 electrical insulators

A

examples:
conductors - copper, aluminium, iron, silver, gold
insulators - wood, plastic, leather, book, pencil

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2
Q

why are copper wires covered with plastic coating

A

to prevent electrical shock

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3
Q

why are wires that cover long distances usually made of steel or aluminium instead of copper?

A

cheaper

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4
Q

what are conductors?

A

materials that have free moving electrons

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5
Q

what are insulators?

A

materials that do not have free moving electrons

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6
Q

when current flows, particles called ____ move.

A

electrons

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7
Q

in metals, these particles are / are not free to move

A

are free to move

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