Question

What is the difference between a conductor and an insulator?
A conductor can get heat transfer through convection and conduction, and an insulator can only get heat transfer from radiation.
A conductor lets heat pass through it easily, and an insulator does not let heat pass through it easily.
A conductor can only get heat transfer through conduction, and an insulator can only get heat transfer from radiation.
A conductor is unaffected by heat, and an insulator is extremely affected by heat.

Answer 1

Correct choice:
"A conductor lets heat pass through it easily, and an insulator does not let heat pass through it easily."

Brief explanation:
- A conductor (e.g. a metal) readily transfers heat — mainly by conduction (free electrons carry thermal energy); in fluids moving parts can also cause convective heat transfer.
- An insulator (e.g. wood, plastic, air) resists heat flow, so it slows conduction (and convection if it’s a gas trapped in pores) and still exchanges heat by radiation.

Why the other options are wrong:
- Conductors are not limited to "convection and conduction" nor are insulators limited only to "radiation" — all materials can exchange heat by conduction, convection (if they or surrounding fluid move), and radiation (to some degree).
- Conductors are not unaffected by heat, and insulators are not "extremely affected" by heat in the sense implied.