What condition creates a direct short in a circuit?

The condition that creates a direct short in a circuit occurs when positive and negative conductors make direct contact with each other. This direct contact allows electrical current to flow unimpeded, bypassing the normal load or resistance, which can lead to an excessive current flow. This excessive current can result in overheating, damage to circuit components, or even fire hazards, making it a critical condition to avoid in electrical systems.

Other options describe scenarios that do not create direct shorts. A broken conductor would result in an open circuit, interrupting the flow of current entirely, while a blown fuse indicates an overcurrent condition that has already been self-corrected by breaking the circuit. Reverse polarity refers to the incorrect connection of positive and negative terminals, which can cause equipment malfunctions but does not create a short circuit in the same way that direct contact does.