CAIE IGCSE Physics Electron Model of Conductors and Insulators

Practise using free-electron mobility to distinguish conductors from insulators, classify materials and explain charge redistribution or earthing in metals.

Exam points

describe conductors as containing mobile free electrons and insulators as lacking mobile charge carriers
classify metals such as brass, aluminium or silver as conductors and glass or plastic as insulators
use electron mobility to explain induction, redistribution over a metal surface and charge flow to Earth

[Maximum number: 2]

Explain how the structure of an electrical conductor differs from the structure of an electrical insulator.

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4.2.1.6—A simple electron model to explain the question 1