| 1 | Wood is a poor conductor of heat and electricity. | |
| 2 | She knows why the metal is the good conductor. | |
| 3 | The best conductor is silver. Copper comes next. | |
| 4 | Certain materials , called conductors, allow electrons to flow through them. | |
| 5 | But manufacturers continue to use copper because it's a better conductor of heat. |