Burglar alarm and typewriter: what they have in common

1. Step 1. Burglar alarm — has part — Electromagnet. A bell.
2. Step 2. Electromagnet — works like — Inductor. An inductor and an electromagnet are both coiled wire; current through them makes a magnetic field.
3. Step 3. Inductor — is part of — Oscillator. An LC circuit.
4. Step 4. Oscillator — is part of — Synthesizer. Sound oscillators.
5. Step 5. Synthesizer — has part — Keyboard. A keyboard.
6. Step 6. Keyboard — is part of — Typewriter. The keys drive levers with type.

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