Electric toothbrush and voltaic pile: what they have in common

1. Step 1. Electric toothbrush — uses — Electromagnetic induction. Wireless charging by induction.
2. Step 2. Electromagnetic induction — is used in — Alternator. It produces current by induction.
3. Step 3. Alternator — has part — Rectifier. A diode bridge.
4. Step 4. Rectifier — is part of — Electrolyser. A direct-current supply.
5. Step 5. Electrolyser — uses — Electrolysis. Electrolysis of water.
6. Step 6. Electrolysis — evolved from — Voltaic pile. The first electrolysis of water was powered by a voltaic pile.

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