What is the expected current at each correctly connected device to a CT if a single phase 5A source is connected?

In a single-phase circuit, the expected current at each correctly connected device to a current transformer (CT) when a 5A source is connected would typically align with the capacity of the CT itself. Current transformers are designed to step down higher currents for measurement and monitoring, allowing safe and accurate readings without directly handling high voltage in the circuit.

When a 5A source is connected to a properly configured CT, the expected output would maintain close to the input current, thus giving an output around 4A to 5A. This range reflects how the CT operates, where the output current is a proportional representation of the primary current (the source current) based on the transformer's ratio.

Given the context of the choices, a value of 4A to 5A accurately represents the expected current flowing through each connected device when a 5A source is used, as it stays within the operational parameters of the current transformer. This understanding is essential for ensuring that equipment remains within designed operational limits and for safe integration into measurement systems.