Final answer:
True, an in-line ammeter must be connected in series with the circuit's load to accurately measure the current flowing through it.
Step-by-step explanation:
The statement is true: An in-line ammeter must indeed be connected as part of the circuit with the load. An ammeter is specifically designed to measure the electric current flowing through a circuit. It is essential for the ammeter to be connected in series with the device whose current is to be measured. This series connection is crucial because it ensures that the same current flows through the ammeter as the rest of the circuit. The design of an ammeter includes a very low internal resistance, typically a fraction of a milliohm, to minimize any influence it may have on the overall circuit resistance. Additionally, for safety, ammeters commonly incorporate a fuse to prevent damage to the meter from excessive currents.