A Shameless Plug

A common household plug consists of the case or cover, two or three pins, a fuse, and a cable grip. The case of a plug is the plastic or rubber parts that surround it. Plastic or rubber materials are used because they are good electrical insulators. The pins inside the plug are made from brass because brass is a good conductor of electricity. The plastic and rubber elements that make the plug safe to use are derived from fossil fuels.