Tram and bell: what they have in common

1. Step 1. Tram — has part — Regenerative braking. Modern trams recover energy.
2. Step 2. Regenerative braking — uses — Electromagnetic induction. Regeneration means the motor working as a generator, i.e. electromagnetic induction.
3. Step 3. Electromagnetic induction — is used in — Tesla coil. A transformer.
4. Step 4. Tesla coil — uses — Resonance. A resonant circuit.
5. Step 5. Resonance — is used in — Bell. The sound.

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