A fault resulting in zero voltage due to a lack of coupling action is characteristic of which condition?

The condition characterized by zero voltage due to a lack of coupling action is related to an open secondary coil. In a transformer, the primary coil generates a magnetic field when voltage is applied, and this field induces a voltage in the secondary coil through electromagnetic induction. If the secondary coil is open, there is no complete circuit for the induced voltage to travel through, leading to a situation where no output voltage is present despite the primary coil functioning.

This situation illustrates the concept of electrical coupling, which is essential for the transfer of energy from the primary to the secondary coil. When the secondary coil is open, the coupling action is disrupted, resulting in zero output voltage. Understanding these electrical principles is crucial for diagnosing transformer-related issues in aircraft electronic systems, which is a fundamental aspect of the Aircraft Electronics Technician certification.