Which device measures electrical connections and system functions?

The device that measures electrical connections and system functions is a multimeter. A multimeter is a versatile instrument commonly used in electrical diagnostics and troubleshooting. It can measure various electrical parameters like voltage, current, and resistance, providing critical information about the functionality of electrical components and circuits.

In practical applications, when a technician needs to check if a connection is live, determine the resistance of a component, or measure the voltage across a circuit, a multimeter is the tool employed for these tasks.

The other options serve different purposes. An oscilloscope visualizes electrical signals over time, allowing for analysis of waveforms rather than direct measurements of connection functionality. A schematic is a representation of the elements within a system, outlining their connections and functions but not measuring them. A generator produces electrical energy and is not designed to measure system functions.