What best defines a short circuit?

• A. An unintended electrical connection between current carrying parts
• B. A device to measure voltage
• C. A circuit with no current
• D. A short is a type of resistor

Answer: (A)

A short circuit is an unintended electrical connection between current-carrying parts that creates a path of very low resistance. Because the current follows the easiest path, most of the supply current flows through this unintended, low-resistance path instead of the intended load, causing a large surge. This can lead to overheating, melted insulation, or tripping a fuse or circuit breaker. A voltmeter is a device to measure voltage, not a short. An open circuit has no current flow at all, not the low-resistance path of a short. A short isn’t a resistor; it’s a path that bypasses the load by presenting much lower resistance. Understanding this helps explain why wiring and protective devices are designed to prevent unintended connections.