A short circuit is best described as:

• A. A circuit with no power source
• B. A path of electrons that follows a shorter path than intended by design
• C. A circuit with zero resistance
• D. A circuit that is always in series

Answer: (B)

A short circuit happens when current finds a path of much lower resistance than the intended load, so most of the current bypasses the designed circuit element. This fits the idea of electrons taking a shorter, unintended route, because the circuit is built to push current through the load with a certain resistance, and a low-resistance bypass draws the current away. The result is excessive current, which can overheat wires, trip breakers, or blow fuses.

It isn’t about having no power source, and in reality there’s usually some finite resistance even along a short path. It’s also not required to be strictly in series; a short can bypass the load by providing a parallel, lower-resistance route.