我想問有關'電'既野(中文答)

1)我想問點解金屬通到電，而木就通唔到電？通電既條件係點？
It is because there are free electrons present in conductors. These free electrons are responsible for conduction of electricity.
The presence of free electrons are much lower in non-conductors (insulators). This is why electricity cannot pass through.

2)咩係自由電子？係咪因為有自由電子先通到電？
"Free electrons"(自由電子) are those electrons that are not bound by atoms. As such, they have high mobility, and are free to move under the influence of electric field. Hence, the name "free" electrons.

Apart from free electrons, any substance that carries free charged particles could conduct electricity. An example is the conduction of electricity in electroyle, in which positive ions are responsible for conduction.

3)之前聽人講過，如果電壓夠大，其實咩都通到電，係咪真？姐係如果用1億w電落舊木到，先唔講會唔會焦，舊木有無可能通電？
It is true, There is no perfect insulators. There is still a few free electrons presence in non-conducting substances. When a high voltage is appled, it could still set up an electric field inside the substance and cause the few free electrons to flow, resulting in a very weak current..