a. the complete circle that an electric current travels.
b. a soft metal, usually a mixture of lead and tin, which can be melted and used to join two metal surfaces, wires etc
c. a tool with a narrow blade at one end that you use for turning screws.
d. a small piece of silicon that has a set of complicated electrical connections on it and is used to store and process information in computers.
e. one of the pieces of metal that sticks out of an electric plug.