What is typically the outcome of applying a load to a transformer?

When a load is applied to a transformer, it generally results in changed input impedance. This is because the load connected to the transformer affects the impedance seen by the primary side. The input impedance of a transformer is affected by both the turns ratio and the load impedance on the secondary side. As the load increases, the current drawn from the transformer also increases, which influences the behavior of the primary circuit.

In a practical sense, when a transformer is loaded, the secondary voltage can decrease slightly due to the increased load (representing a drop in secondary voltage under load conditions), and this will affect the amount of current drawn on the primary side. Therefore, the input impedance changes as the load varies, which reflects the relationship between the primary and secondary sides of the transformer.

The other choices do not accurately reflect the typical outcome of applying a load to a transformer. While applying a load can affect primary voltage and secondary current, they do not lead to a direct, consistent relationship like the change in input impedance does. The turns ratio of a transformer is a fixed characteristic determined by the winding configuration and does not change in response to loading.