Electric scooter and modem: what they have in common

1. Step 1. Electric scooter — has part — Lithium-ion battery. A lithium-ion battery.
2. Step 2. Lithium-ion battery — uses — Electrochemical reaction. Electrons flow through the external circuit while lithium ions move between the electrodes.
3. Step 3. Electrochemical reaction — is used in — Fax. The paper darkened under current.
4. Step 4. Fax — has part — Modem. It transmits an image over a telephone line.

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