Quote:
Originally Posted by jamesqf
Sure, but the key there is the short distance. Remember your inverse square law? You might also compare the amount of energy actually captured by the RFID device with the amount output by the reader. The key to the system is the sensitivity of the detector in the reader...
Then remember conservation of energy. Say you have a 50 KW radio transmitter: even if you had a 100% efficient source/receiver coupling, how many people could draw 1 KW from that radio broadcast?
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http://amasci.com/tesla/tesceive.html
No, I would not expect radio to power all of our transportation, but wouldn't you rather use even a small amount of that 50kW to power some cars instead of just letting it get lost to the environment? Use it or lose it.
If the power receivers are in the cars themselves, they can be programmed to share the power. If it's just one at a hydrogen generation plant, it's even easier since there's only one receiver until some rivals set up a competing plant...