Final answer:
A constant voltage generator maintains a constant output voltage and adjusts power based on tissue impedance, does not create resistance, and needs to generate high current at frequencies like 200 kHz. However, it does not deliver the same power regardless of tissue properties.
Step-by-step explanation:
Attributes of constant voltage generators include their ability to keep voltage output constant while adjusting the power level based on tissue impedance, which is correct as per option 1. However, they do not create tissue resistance, as resistance is a property of the tissue itself, so option 2 is incorrect. They must generate sufficiently high current at a specific frequency to function properly, like 200 kHz, which is true, making option 3 correct as well. Option 4, however, is incorrect as a constant voltage generator will deliver different amounts of power depending on the tissue properties or impedance; the power delivered will vary according to Ohm's Law.