An ammeter is always connected in what configuration with the line?

An ammeter must be connected in series with the circuit in order to accurately measure the current. This is because an ammeter is designed to measure the flow of electric charge through a conductor. When placed in series, all of the current that flows through the circuit also flows through the ammeter, allowing it to provide an accurate reading of the current in the system.

Connecting the ammeter in parallel, for example, would result in an alternate path for the current, which could lead to inaccurate measurements and potentially damage the ammeter due to excessive current bypassing it. This configuration is critical because ammeters have a very low internal resistance, ensuring that they do not significantly alter the current flowing through the circuit during the measurement.

In summary, the series connection is essential for both accuracy and safety in current measurement.