What is a typical application of a "buck and boost" transformer?

A "buck and boost" transformer is specifically designed to adjust voltage levels, making it an essential component in various electrical applications where differing voltage requirements exist. This type of transformer can either decrease (buck) or increase (boost) voltage to ensure that the electrical load receives an adequate level of voltage necessary for its operation.

For instance, if a piece of equipment requires a specific operating voltage that is different from the supply voltage, a buck and boost transformer can modify the voltage to meet those precise needs. This ensures that equipment operates safely and efficiently without risking damage from overvoltage or under-voltage conditions.

The other options, while related to electrical function, do not accurately describe the primary purpose of a buck and boost transformer. Electrical isolation is typically achieved using isolation transformers, reducing electrical noise is more aligned with the functions of filter circuits or noise suppression devices, and stepping down voltage is the role of a standard step-down transformer, which does not adjust beyond providing lower voltages.