What is a common indication of a short circuit?

A blown fuse is a common indication of a short circuit because when a short circuit occurs, it creates a path of very low resistance in an electrical circuit. This situation causes an excessive amount of current to flow through the circuit. Fuses are safety devices designed to protect against such overloads. When the current exceeds the fuse's rated limit, the fuse melts, breaking the circuit and preventing further damage or potential hazards such as fires.

In contrast, humming motors or flickering lights may indicate different kinds of electrical issues, such as problems with voltage supply or load imbalances, but these are not specific indicators of short circuits. Increased voltage can also indicate a problem, but it does not directly relate to the immediate consequences of a short circuit. Thus, recognizing a blown fuse as a response to a short circuit is crucial for troubleshooting and safety in electrical systems.