Radio broadcasting and voltaic pile: what they have in common

1. Step 1. Radio broadcasting — uses — Radio. Broadcasting by radio.
2. Step 2. Radio — includes — Transistor radio. A radio receiver.
3. Step 3. Transistor radio — has part — Dry cell. Batteries.
4. Step 4. Dry cell — evolved from — Voltaic pile. A convenient form of the galvanic cell.

Open Evothings