Which device attaches to an electrical cord to allow multiple power tools to be supplied by a single cord?

The correct choice is a junction box. A junction box serves as a connection point for electrical wires, allowing multiple circuits or devices to be connected to a single power source. When it comes to powering multiple tools from a single electrical cord, a junction box can safely facilitate this by distributing the electrical current to various outlets that might be connected to power tools.

In contrast, an inverter is used to convert direct current (DC) to alternating current (AC) but does not serve the purpose of distributing power from an electrical cord to multiple devices. Load shedding refers to the intentional reduction of electrical demand, often during peak usage times or in the event of a power supply constraint, and it is not a device used for connecting multiple power tools. A sprayer, typically associated with painting or applying liquids, is unrelated to electrical supply or distribution.