Question

Why might someone use aluminum foil on a doorknob when alone?

A. To prevent static electricity
B. To avoid fingerprints
C. To create a makeshift doorbell
D. To reflect signals

Answer 1

Aluminum foil is used on doorknobs to minimize and prevent static electricity shocks by dispersing built-up charges.

Step-by-step explanation:

Someone might use aluminum foil on a doorknob when alone to prevent static electricity. This is because aluminum foil can disperse the charge, thus minimizing the risk of a static shock. In dry environments, static electricity can build up on our bodies as we walk across carpeted surfaces or after sliding across a car seat. The charge is transferred through a process called charging by conduction, where excess electrons from one's body move to a metal doorknob to spread out. Covering a doorknob with aluminum foil helps in reducing the buildup of an induced charge and prevents the unpleasant zap we sometimes experience upon touching metal objects. This is similar to the conductive strips used in hospital settings to prevent sparks in flammable environments.