Power rails and bell: what they have in common

1. Step 1. Power rails — is part of — Breadboard. Lengthwise strips for power.
2. Step 2. Breadboard — uses — Electrical conduction. Contact strips.
3. Step 3. Electrical conduction — is used in — Light switch. Contacts close the circuit.
4. Step 4. Light switch — is part of — Electric bell. A button.
5. Step 5. Electric bell — is part of — Alarm clock. A bell.
6. Step 6. Alarm clock — has part — Bell. A bell rings.

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