Mariel charges her iPod with a cord that plugs into an electrical socket on the wall. The cord has a plug with metal prongs. Why are the prongs made of metal?
The prongs are made of metal because metal is a good conductor of electricity. The prongs allow the electrical current to flow from the socket to the iPod so that it can charge. If the prongs were made of a different material, such as plastic or wood, they would not be able to conduct electricity effectively and the iPod would not be able to charge.
