Bell gong and atomic clock: what they have in common

1. Step 1. Bell gong — is part of — School bell. A metal cup resonator.
2. Step 2. School bell — has part — Electromagnet. An electromagnet strikes the hammer.
3. Step 3. Electromagnet — works like — Inductor. An inductor and an electromagnet are both coiled wire; current through them makes a magnetic field.
4. Step 4. Inductor — is part of — Oscillator. An LC circuit.
5. Step 5. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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