An ignition transformer increases voltage from 120 to ___________ volts.

An ignition transformer is designed to provide the high-voltage spark necessary to ignite fuel in heating systems, such as in oil or gas burners. Ignition transformers typically convert the standard line voltage of 120 volts to a much higher voltage, allowing for effective ignition of the fuel.

The correct answer indicates that the ignition transformer increases voltage to 10,000 volts, which is a common specification for these devices. This high voltage is essential to create a sufficient spark that can reliably ignite the fuel-air mixture in the combustion chamber. The choice of 10,000 volts aligns with industry standards for safe and efficient operation of heating systems.

Higher voltage options, such as 15,000 or 20,000 volts, are typically not standard for residential or most commercial heating systems. Therefore, the 10,000-volt output is a practical and widely used specification that meets the necessary requirements for ignition without being excessive.