TestOut LabSim A+ Certification Practice Exam

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Prepare for the TestOut LabSim A+ Certification Exam with in-depth flashcards and detailed multiple choice questions. Each query is accompanied by hints and comprehensive explanations. Ace your certification with thorough preparation!

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What is the main function of a multimeter when testing a power supply?

To measure current only
To measure voltage
To measure frequency
To measure resistance only

The correct answer is: To measure voltage

The main function of a multimeter when testing a power supply is to measure voltage. This is crucial because the output voltage of a power supply must be verified to ensure that it is within the specified range for the devices it powers. Voltage measurement helps in diagnosing whether a power supply is functioning correctly or if it is providing the correct output required by the circuit or devices. While a multimeter can indeed measure current and resistance, the primary objective when assessing a power supply is to check the voltage levels, as undervoltage or overvoltage can lead to damage or failure of electronic components. Measuring current or resistance can be useful in specific scenarios, but those are secondary functions when verifying the proper operation of a power supply. Additionally, measuring frequency is not typically relevant in the context of testing a standard DC or AC power supply, making voltage measurement the most significant function in this scenario.