Which material is cited as a good conductor in which electrons are dislodged fairly easily?

• A. Porcelain & Glass
• B. Copper or Aluminum
• C. Copper & Porcelain
• D. Brass & Stainless Steel

Answer: (B)

Conductivity comes from having many electrons that can move freely in response to an electric field. Metals with a high density of free electrons have very low resistivity, so electrons can be set into motion easily when a voltage is applied. Copper and aluminum are especially good conductors because they provide a clear path for those electrons to move with minimal resistance. Porcelain and glass are insulators; their electrons are tightly bound and resist movement, so they don’t conduct well. Brass and stainless steel are less conductive than pure copper or aluminum, so they don’t match their level of ease for electron flow. So, copper or aluminum best fit the description of a good conductor where electrons can move readily.