Explain why the main supply cables in a house are made thick while the fuse wire…

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

Explain why the main supply cables in a house are made thick while the fuse wire protecting the same circuit is kept very thin, even though both carry the same current for normal operation.

Related theory

Resistivity of Materials
Resistance & Resistivity
Heating Effect of Current
Electrical Energy
Electrical power and energy
Electricity
Resistance: geometry and temperature dependence
Current Electricity

Browse the problem library