What does a typical handheld multimeter measure in basic mode?
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Acurrent
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Bvoltage
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Cresistance
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Dcurrent, voltage, and resistance
Answer
Correct Answer: current, voltage, and resistance
Explanation
Introduction / Context:Multimeters are essential diagnostic tools for electronics and electrical work. Understanding their core measurement capabilities ensures safe, accurate troubleshooting and component verification in both DC and AC applications.
Given Data / Assumptions:
- Standard digital multimeter (DMM) operation.
- Basic, non-specialized model (no advanced functions assumed).
Concept / Approach:At minimum, a DMM measures three fundamental electrical quantities: voltage (V), current (I), and resistance (R). Many meters add continuity and diode test, and more advanced meters include capacitance, frequency, or temperature, but the core triad is V–I–R.
Step-by-Step Reasoning:
Voltage measurement: connect leads across a component or source; meter in parallel.Current measurement: insert meter in series; use proper input jack and range to avoid fuse damage.Resistance measurement: de-energize the circuit; meter injects a small test current and measures the resulting voltage drop.Verification / Alternative check:User manuals list functions on the selector dial—V (AC/DC), A (AC/DC), and Ω are always present in general-purpose DMMs, confirming the V–I–R capability set.
Why Other Options Are Wrong:
- Only current, only voltage, or only resistance: Each describes a single capability; a basic multimeter performs all three.
Common Pitfalls:
- Measuring current with the leads in the voltage jack—this can blow the meter’s fuse.
- Measuring resistance on a live circuit—can damage the meter or give false readings.
Final Answer:current, voltage, and resistance