electrical component can only work if it is traversed by an electric
It must therefore receive the electric current and then let it out.
of a terminal: It is an area of an electrical component that can
receive the electric current or let it out.
Comment: a terminal is also used to make connections, which means
connecting an electrical component to another electrical component.
electrical components can have multiple input terminals and multiple
output terminals (such as transistors or operational amplifiers).
For now we consider only simple electrical components having only one
input terminal and one output terminal that are called dipole.
of a two-terminal component: this is simply an electrical component
that has two terminals.
Examples of dipoles: batteries, bulbs, switches so on.