alleryStart learning →Why are good electrical conductors usually good conductors of heat as well?
ATheir bound electrons block heat flow
BTheir free electrons carry thermal energy
CTheir high resistivity generates heat
DTheir atoms are held rigidly in place
Answer & Solution
Correct answer: B. Their free electrons carry thermal energy
1. A good electrical conductor is defined by having large numbers of free electrons.
2. Those same free electrons can also transport thermal energy through the material.
3. So one population of carriers serves both jobs, and the two conductivities track each other.
4. High resistivity would work against electrical conduction, so it cannot be the reason for the pairing.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Conduction of Electricity and Heat_
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