Which reading would you expect from an intact, functional transformer?

In a functional transformer, the expectation is not to measure resistance in the same way as with standard resistive components. Instead, a transformer’s windings are designed to allow alternating current (AC) to flow through inductive coupling while resisting direct current (DC). As a result, when checking the resistance of a functional transformer using a multimeter, you should ideally see a reading that indicates continuity without any significant resistive load — effectively registering as “no resistance” or very low resistance.

If there were higher than normal resistance, it could suggest insulation failure or damage within the coils, indicating that the transformer is not functioning properly. Variable resistance readings can occur if there are issues such as winding shorts or intermittent connections, which again signifies a problem. On the other hand, a short circuit would indicate a complete failure of the transformer, leading to no operational voltage across the secondary windings. Thus, the expectation for a functional transformer is to show continuity without substantial resistance, aligning with the outcome of “no resistance.”