How is the memory inside card chips read without a power source?

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Track title: CC C Schuberts Piano Sonata No 13 D

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Chapters
00:00 Question
00:28 Accepted answer (Score 75)
01:20 Answer 2 (Score 42)
02:18 Answer 3 (Score 2)
02:56 Thank you

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Full question
https://superuser.com/questions/1363841/...

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Tags
#memory #embedded

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