What does a Digital Multi Meter (DMM) measure?

A Digital Multi Meter (DMM) is designed to measure multiple electrical parameters including voltage, current, and resistance, making it an essential tool for electrical troubleshooting and analysis. The ability to measure voltage allows users to determine the electrical potential difference between two points in a circuit, which is crucial for ensuring that components are receiving the correct voltage levels. Measuring resistance helps in checking the integrity of electrical connections and components, allowing for the identification of faults such as short circuits or open circuits.

While some other options suggest narrower measurements—like measuring only current, power output, or continuity—the DMM's versatility makes it applicable for a wide range of testing scenarios. Thus, option B accurately captures the primary functionalities of a DMM by including both voltage and resistance measurements, highlighting its role in comprehensive electrical diagnostics.