What type of transformer is utilized for series streetlights and what is its output current?

The correct choice indicates that a constant current transformer is used for series streetlights, with an output current of 6.6 amps. This is significant because series streetlighting requires a specific current to ensure consistent brightness and optimal performance across all lights in the system.

A constant current transformer regulates the output to deliver a stable current, regardless of the load, which is essential for series configurations where each streetlight is part of the same circuit. By providing a standardized current of 6.6 amps, the transformer ensures that each light operates effectively, avoiding variations in light intensity that could result from differing voltage drops across each fixture.

This setup is commonly used in older streetlight systems, especially with certain types of lamps that perform well with a consistent current. The choice of 6.6 amps aligns with historical standards in street lighting, further supporting the reliability of illumination along streets and pathways.