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SESK: Stuff Everyone Should Know · sesk.info/elec-ammeter-series

To measure current with an in-line ammeter, how is it connected to the circuit?

Ammeters connect in series.

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  1. In parallel across the device
  2. Across the power source terminals
  3. In series with the device ✔

Why: All the current you want to measure has to flow through the meter. That means opening the circuit and putting the meter in the gap.

Huh, didn't know that: In a single-loop circuit an ammeter reads the same no matter where in the loop you insert it.

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References

Answer: In series with the device. All the current you want to measure has to flow through the meter. That means opening the circuit and putting the meter in the gap.

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

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