Which device is used to measure multiple electrical values such as voltage, current, and resistance?

• A. Electrical Safety Analyzer
• B. Digital Multimeter
• C. Blood Gas Analyzer
• D. Thermometer

Answer: (B)

A digital multimeter is the tool designed to measure multiple electrical parameters with one instrument. It combines a voltmeter, an ammeter, and an ohmmeter in a single device. To measure voltage, you place the probes across the test points and read the potential difference (AC or DC as the meter supports). To measure current, you connect the meter in series with the circuit using the appropriate current range. To measure resistance, you ensure the circuit is de-energized and place the probes across the component to determine its resistance in ohms. Many DMMs also offer continuity checks and other functions, but the core idea is that it can read volts, amps, and ohms with one tool. The other options serve different purposes: an Electrical Safety Analyzer checks safety performance like leakage and hipot testing; a Blood Gas Analyzer analyzes clinical blood gases; a Thermometer measures temperature.