Guitar and voltaic pile: what they have in common

1. Step 1. Guitar — evolved into — Electric guitar. Electrification.
2. Step 2. Electric guitar — has part — Amplifier. An amplifier.
3. Step 3. Amplifier — is part of — pH meter. It amplifies the weak signal of the electrode.
4. Step 4. pH meter — uses — Electrochemical reaction. A glass electrode.
5. Step 5. Electrochemical reaction — is used in — Voltaic pile. Current arises from the reaction of dissimilar metals with an electrolyte.

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