PhysicsChapter 6: Electrostatics
Conductors and Insulators
Introduction
This topic compares the electrical behaviour of conductors and insulators.
Definition
Conductors
Conductors contain charges that can move relatively freely. Examples: * copper; aluminium; silver. They are useful for: * electrical wiring; earthing; charge redistribution.
Insulators
Insulators strongly restrict charge movement. Examples: * rubber; plastic; glass; ceramic. They are useful for: wire coverings; electrical supports; protection from unwanted current.
Main Comparison
Conductor Charge mobility → high Typical use → carry current/charge Static charge → redistributes Insulator Charge mobility → low Typical use → prevent unwanted charge/current movement Static charge → may remain localised
Why Both Are Needed
Electrical systems need conductors to carry charge and insulators to control where charge is allowed to move.
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Sticky Notes · Quick Revision
CONDUCTOR
- Charge moves
INSULATOR
- Charge restricted
BOTH
- Needed in circuits