Summary
- Delivered power, distance, alignment and end-to-end efficiency must be reported together.
- A useful pilot must also measure heat, interference, safety controls and performance with real devices and people nearby.
Wireless power transmission removes a physical connector, not the laws governing energy loss. Inductive systems can work efficiently over very short gaps when coils are aligned. Resonant or radio-frequency approaches can extend reach, but the amount of useful power and the efficiency usually change with distance, obstacles and receiver position.
That makes a percentage quoted without a test boundary hard to interpret. Transmitter efficiency is not the same as power delivered into a device battery. A laboratory result at one fixed alignment does not establish room-scale performance, and a demonstration that lights a sensor does not prove that a larger load can be supplied continuously.
The operational case should specify input power, delivered watts, separation, receiver size, duty cycle and conversion losses. It should also report what happens when a person or metal object enters the field, whether communication systems experience interference, and how the transmitter detects an unauthorised or misplaced receiver.
For infrastructure buyers, the comparison is with a cable or replaceable battery, not with no power at all. Installation convenience must outweigh extra energy use, maintenance, equipment cost and regulatory constraints.
The next credible evidence is a repeatable pilot under occupied conditions with an energy meter at both ends. Until those measurements are public, wireless power is a family of useful techniques—not a single proven substitute for wiring.
