What tool is commonly used to measure electrical current?

The ammeter is the tool designed specifically for measuring electrical current, making it the correct answer. This device allows electricians and technicians to determine the flow of electric charge in a circuit, which is essential for ensuring the proper functioning of electrical systems and troubleshooting issues. An ammeter is typically placed in series with the circuit to measure current in amperes.

On the other hand, a voltmeter measures voltage, an ohmmeter measures resistance, and a wattmeter measures power in watts. While all these tools are useful in electrical work, only the ammeter is tailored for current measurements, making it indispensable for tasks that require precise current readings. Understanding the distinct purposes of each tool is crucial for effective electrical diagnostics and system analysis.