Ammeters should be connected in what configuration within a circuit?

Ammeters are designed to measure the current flowing through a circuit. To accurately measure this current, they must be connected in series with the circuit elements. When placed in series, the ammeter becomes part of the circuit, allowing it to measure the total flow of electrons through that section of the circuit without altering the current itself. This configuration ensures that all the current flowing through the circuit passes through the ammeter, providing an accurate measurement.

Connecting an ammeter in parallel, for instance, can lead to serious issues such as short circuits or damage to the ammeter, as it would create a path for current to bypass the other components, potentially resulting in higher than rated current flow through the ammeter. The other choices referring to vertical and horizontal configurations do not pertain to the electrical connection in terms of circuit design, since they do not specify a method of current measurement or connection relevant to the functionality of an ammeter.