When measuring load current, how should the ammeter be connected?

The ammeter should be connected in series with the load when measuring load current because an ammeter is designed to measure the flow of current through a circuit. Connecting it in series ensures that all the current flowing through the load also passes through the ammeter.

In series configuration, the ammeter becomes part of the circuit, providing an accurate measurement of the total current that flows to the load without affecting the circuit operation. This is crucial because if the ammeter were connected in parallel, it could create a short circuit, leading to equipment damage or dangerous conditions.

Similarly, connecting the ammeter across the terminals of the load or from one load terminal to ground would not provide an accurate measurement of the current flowing through the load. In those scenarios, the ammeter would either not measure the current adequately or would be subjected to a voltage, which it is not designed to handle, potentially damaging the device. Connecting in series is the appropriate and safe method for obtaining correct current readings in electrical systems.