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

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When we use our debit cards or any card with a chip inside of it that gets immediately read when scanned, how is the memory inside the chip retrieved since the card isn't exactly "turned on" much like a standard computer?






memory embedded







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  • en.wikipedia.org/wiki/Radio-frequency_identification
    – Máté Juhász
    2 hours ago














up vote
2
down vote

favorite












When we use our debit cards or any card with a chip inside of it that gets immediately read when scanned, how is the memory inside the chip retrieved since the card isn't exactly "turned on" much like a standard computer?






memory embedded







share|improve this question







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J.Doe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • en.wikipedia.org/wiki/Radio-frequency_identification
    – Máté Juhász
    2 hours ago












up vote
2
down vote

favorite









up vote
2
down vote

favorite











When we use our debit cards or any card with a chip inside of it that gets immediately read when scanned, how is the memory inside the chip retrieved since the card isn't exactly "turned on" much like a standard computer?






memory embedded







share|improve this question







New contributor




J.Doe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











When we use our debit cards or any card with a chip inside of it that gets immediately read when scanned, how is the memory inside the chip retrieved since the card isn't exactly "turned on" much like a standard computer?






memory embedded




memory embedded






share|improve this question







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J.Doe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







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J.Doe is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Check out our Code of Conduct.











  • en.wikipedia.org/wiki/Radio-frequency_identification
    – Máté Juhász
    2 hours ago
















  • en.wikipedia.org/wiki/Radio-frequency_identification
    – Máté Juhász
    2 hours ago















en.wikipedia.org/wiki/Radio-frequency_identification
– Máté Juhász
2 hours ago




en.wikipedia.org/wiki/Radio-frequency_identification
– Máté Juhász
2 hours ago










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You may find the answer in Wikipedia
Smart card - Contactless smart cards :




Contactless smart cards



A second card type is the contactless smart card, in which the card communicates with and is powered by the reader through RF induction technology (at data rates of 106–848 kbit/s). These cards require only proximity to an antenna to communicate. Like smart cards with contacts, contactless cards do not have an internal power source. Instead, they use an inductor to capture some of the incident radio-frequency interrogation signal, rectify it, and use it to power the card's electronics.







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    1 Answer
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    active

    oldest

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    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    5
    down vote



    accepted










    You may find the answer in Wikipedia
    Smart card - Contactless smart cards :




    Contactless smart cards



    A second card type is the contactless smart card, in which the card communicates with and is powered by the reader through RF induction technology (at data rates of 106–848 kbit/s). These cards require only proximity to an antenna to communicate. Like smart cards with contacts, contactless cards do not have an internal power source. Instead, they use an inductor to capture some of the incident radio-frequency interrogation signal, rectify it, and use it to power the card's electronics.







    share|improve this answer
























      up vote
      5
      down vote



      accepted










      You may find the answer in Wikipedia
      Smart card - Contactless smart cards :




      Contactless smart cards



      A second card type is the contactless smart card, in which the card communicates with and is powered by the reader through RF induction technology (at data rates of 106–848 kbit/s). These cards require only proximity to an antenna to communicate. Like smart cards with contacts, contactless cards do not have an internal power source. Instead, they use an inductor to capture some of the incident radio-frequency interrogation signal, rectify it, and use it to power the card's electronics.







      share|improve this answer






















        up vote
        5
        down vote



        accepted







        up vote
        5
        down vote



        accepted






        You may find the answer in Wikipedia
        Smart card - Contactless smart cards :




        Contactless smart cards



        A second card type is the contactless smart card, in which the card communicates with and is powered by the reader through RF induction technology (at data rates of 106–848 kbit/s). These cards require only proximity to an antenna to communicate. Like smart cards with contacts, contactless cards do not have an internal power source. Instead, they use an inductor to capture some of the incident radio-frequency interrogation signal, rectify it, and use it to power the card's electronics.







        share|improve this answer












        You may find the answer in Wikipedia
        Smart card - Contactless smart cards :




        Contactless smart cards



        A second card type is the contactless smart card, in which the card communicates with and is powered by the reader through RF induction technology (at data rates of 106–848 kbit/s). These cards require only proximity to an antenna to communicate. Like smart cards with contacts, contactless cards do not have an internal power source. Instead, they use an inductor to capture some of the incident radio-frequency interrogation signal, rectify it, and use it to power the card's electronics.








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        answered 2 hours ago









        harrymc

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