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USCG Exam PracticeElectrical measuring devices and instrumentation

When connecting a voltmeter to measure the voltage across a load in a live circuit, the correct procedure is to connect the meter:

  1. A. In series with the load, using the lowest range first
  2. ✓ In parallel with the load, starting on the highest rangeCorrect
  3. C. In series with the load, starting on the highest range
  4. D. In parallel with the load, using the lowest range first

Why B is correct

A voltmeter must be connected in parallel (across) the component being measured because it has high resistance and must not carry load current. Starting on the highest range prevents meter damage if the voltage is higher than expected.

Cited:NEETS Mod. 3 §1-2

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When connecting a voltmeter to measure the voltage across a load in… — USCG Exam Practice · CaptainsGround