I can’t wrap my brain around how nfc just “holds data” but doesn’t need power to transmit data? Like how do ID cards use nfc?
In: 6
NFC **does** need electricity. NFC cards /labels don’t have batteries because they are powered by the reader through induction (the same way wireless phone charging pads do it).
The reader has an moving magnetic field, sends a tiny amount of power to the card, just enough to get it to transmit a weak radio signal with data.
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