Interrupter contact and payment card: what they have in common

1. Step 1. Interrupter contact — is part of — School bell. It breaks the circuit, making the armature vibrate.
2. Step 2. School bell — has part — Electromagnet. An electromagnet strikes the hammer.
3. Step 3. Electromagnet — is part of — Tape recorder. Recording heads are electromagnets.
4. Step 4. Tape recorder — has part — Magnetic tape. Magnetic tape.
5. Step 5. Magnetic tape — uses — Magnetism. Recording by magnetization.
6. Step 6. Magnetism — is used in — Payment card. A magnetic stripe.

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