Wave Talkers Amateur Extra Exam Prep: E7 Questions

E7D10:

What is the primary reason that a high-frequency switching type high-voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

The inverter design does not require any output filtering
It uses a diode bridge rectifier for increased output
The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output
It uses a large power factor compensation capacitor to recover power from the unused portion of the AC cycle