Certified Apartment Maintenance Technician (CAMT) Practice Exam 2025 - Free CAMT Practice Questions and Study Guide

The multimeter is the correct tool used to check voltage, ohms, and amperage in an air conditioning system because it is a versatile device capable of performing multiple electrical measurements. This tool combines the functions of a voltmeter, ammeter, and ohmmeter into one.

When diagnosing air conditioning systems, technicians often need to assess various electrical parameters. For instance, measuring voltage can help identify if the unit is receiving the appropriate power supply, while measuring amperage can be critical to understanding the load on the electric motor or compressor. Furthermore, testing resistance (ohms) is essential for checking the condition of components like motors and coils. The multimeter's ability to switch between these functions makes it invaluable for effective troubleshooting and maintenance in the field.

While a voltmeter specifically measures voltage, an ammeter focuses on amperage, and an ohmmeter is used solely for checking resistance, none of these tools alone can perform the comprehensive range of measurements that a multimeter can. This ability to combine multiple functionalities into one tool is what makes the multimeter the most appropriate choice for checking all three electrical parameters in an air conditioning system.