Question

Which power supply is much smaller and lighter, uses

Answer 1

Answer: There's no long-distance energy transfer. This looks almost like a plain old transformer (yet with an air core) and I've never heard of a 7 kilowatt transformer wasting as much as 14 percent energy in conversion - dissipating about one kilowatt of power would just melt the transformer. How realistic is the "86% efficiency" claim?

Explanation: