Final answer:
The secondary voltage of the ignition transformer used on a high-pressure oil burner can range from 5,000 to 20,000 volts.
Step-by-step explanation:
The secondary voltage of the ignition transformer used on a high-pressure oil burner can vary depending on the specific application and design of the burner. However, typically, the secondary voltage of an ignition transformer used on a high-pressure oil burner is in the range of 5,000 to 20,000 volts.