Alternating current and payment card: what they have in common

1. Step 1. Alternating current — uses — Electromagnetic induction. Alternating current is produced by induction generators.
2. Step 2. Electromagnetic induction — is used in — NFC. The phone's coil induces a current in the card's coil — electromagnetic induction.
3. Step 3. NFC — is used in — Payment card. Contactless cards.

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