Why can more power be drawn from a transformer during the winter?

The correct answer highlights the relationship between lower ambient temperatures and the performance of transformers. During winter, the colder temperatures can lead to increased efficiency in electrical conduction and lower resistance within the transformer. This allows transformers to handle a larger load without overheating compared to warmer months.

While higher demand for electricity in winter is a significant factor—since more people use heating systems—it does not directly pertain to the transformer’s ability to supply power. Transformers can be rated for specific capacities, and that capacity can often be maximized in colder conditions.

Shorter daylight hours and reduced humidity levels do not have a direct impact on the power capacity of transformers. Daylight hours affect the demand patterns for electricity but do not influence the physical properties of the transformer during winter months. Reduced humidity could have some impact on conductivity, but it is not the primary reason power capacity increases in winter.

Thus, acknowledging the temperature's effect on resistance and efficiency is crucial to understanding why transformers can deliver more power in winter conditions.