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To measure the voltage across a device, how is a voltmeter connected?

Voltmeters connect in parallel with what you measure.

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  1. In series with the device
  2. In parallel with the device ✔
  3. Around one wire with a clamp

Why: Voltage is measured across two points, so the meter bridges them. Putting a voltmeter in series would block the circuit.

Huh, didn't know that: OpenStax notes most analog meters are built around a galvanometer, whose needle swings in proportion to current.

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References

Answer: In parallel with the device. Voltage is measured across two points, so the meter bridges them. Putting a voltmeter in series would block the circuit.

  1. OpenStax College Physics 2e, 21.4 DC Voltmeters and Ammeters openstax.org/books/college-physics-2e/pages/21-4-dc-voltmeters-and-ammeters
    Voltmeters are connected in parallel with whatever device’s voltage is to be measured.
    Checked 2026-10-10.

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