What is a short circuit?

A short circuit occurs when there is a fault in an electrical system that allows current to flow along an unintended, often low-resistance path. This unintended path can significantly increase the current flow beyond normal operating levels, potentially causing damage to electrical components, overheating, or even fire hazards. Understanding short circuits is crucial for electrical safety and design, as they can lead to catastrophic failures in electrical systems.

The other options describe different concepts: a circuit breaker is a device designed to protect electrical circuits by interrupting the flow in case of overload or fault conditions; boosting voltage refers to increasing voltage levels in a circuit, typically done with transformers; and increasing resistance in a circuit pertains to the opposition to current flow, which is not inherently related to the concept of a short circuit.