A blown fuse in a power supply usually indicates what?

A blown fuse in a power supply typically indicates that too much current is being drawn. Fuses are designed to protect electrical circuits by interrupting the flow of electricity when a certain current threshold is exceeded. When the current surpasses the rating of the fuse, it heats up and ultimately blows, breaking the circuit to prevent damage to the connected devices or wiring.

While it's true that a blown fuse could be due to an overload caused by too many devices connected, the root cause is ultimately the excessive current being drawn, which aligns with the selected answer. Other possibilities, like a short circuit or a faulty fuse, are less common or might not be the initial cause of the blown fuse in the context of overcurrent situations. Thus, understanding the relationship between current draw and fuse protection helps clarify why identifying excessive current as the cause is essential for proper troubleshooting and electrical safety measures.