alleryStart learning →How must a voltmeter be joined to the device whose voltage is wanted?
AIn parallel with it, so both see one voltage
BIn series with it, so both carry one current
CIn parallel with the battery only, never the load
DIn series with the battery, ahead of the load
Answer & Solution
Correct answer: A. In parallel with it, so both see one voltage
1. Objects wired in parallel all sit across the same pair of points, so they share one potential difference.
2. Putting the voltmeter in parallel with a device therefore hands the meter the very voltage being sought.
3. The meter is made with a large resistance so that this extra branch draws almost no current.
4. Wiring it in series would instead give it the branch current, which is what an ammeter is built to read.
_Source: OpenStax College Physics (CC BY 4.0), Ch 21 "Circuits and DC Instruments", section 21.4 DC Voltmeters and Ammeters_
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