Which of the following is a common tool used for measuring electrical current?

The correct answer is the multimeter. A multimeter is a versatile tool that can measure various electrical parameters, including voltage, current, and resistance. It can be set to measure direct current (DC) or alternating current (AC) and provides a digital or analog readout, which makes it useful for a wide range of electrical troubleshooting and diagnostics in industrial settings.

While the voltmeter is specifically designed to measure voltage, it does not measure current directly. An ammeter, similar to a multimeter, measures current but is usually limited to that function alone. An oscilloscope, on the other hand, is primarily used to visualize the waveform of electrical signals rather than directly measuring current as a standalone function. Therefore, while other tools have specific applications, the multimeter's ability to measure current along with several other electrical properties makes it a common tool used for this purpose.