🔍 Key Concepts
• Basic DMM functions – what measurements almost every inexpensive handheld meter can do right out of the box
• Difference between resistance and reactance (reactance involves AC and phase shift; resistance is DC opposition to current)
• Which quantities (voltage, current, resistance, frequency, reactance) require specialized or more advanced meters
💭 Think About
• Think about the three most fundamental electrical quantities you learn first in Ohm’s Law and basic circuits. Which choice lists exactly those three?
• Which of the listed quantities normally needs AC test conditions and phase/impedance calculations, not just simple two‑lead measurements?
• Look at each option and ask: is this set of measurements typical for the simplest, cheapest DMM you might buy for basic troubleshooting?
✅ Before You Answer
• Verify which quantities are included on the front dial of a basic DMM (common symbols: V, A, Ω).
• Check your understanding that reactance (Xc, Xl) is part of impedance in AC circuits, not usually a direct function on a simple DMM.
• Confirm that frequency measurement, when present, is a bonus feature on some meters but not part of the most basic “three-function” DMM capability.