What, exactly, is necessary to establish electrical continuity between two wires? If I want to have an electric current flow out of one wire and into another, what must be done with those two wires to make that flow path complete?
Conversely, what things might prevent continuity from being established between two wires when they are supposed to electrically connect with one another?
Solderless breadboards provide convenient means for electronics hobbyists, students, technicians, and engineers to build circuits in a non-permanent form. The following illustration shows a three-resistor series circuit built on a breadboard:
The interconnections between the metal spring clips within the holes of the breadboard allow continuity between adjacent leads of the resistors, without the resistor leads having to be jammed into the same hole.
However, new students often get themselves into trouble when first learning how to use solderless breadboards. One common mistake is shown here, where a student has attempted to create a simple single-resistor circuit:
What the student has actually created here is a short circuit. Re-draw this circuit in schematic form, and explain why this circuit is faulty.