Tram and smart meter: 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 — Electricity meter. An induction meter has a rotating disc.
4. Step 4. Electricity meter — evolved into — Smart meter. A digital meter.

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