Mixing console and lead–acid battery: what they have in common

1. Step 1. Mixing console — has part — Potentiometer. Faders.
2. Step 2. Potentiometer — is made of — Nickel. The resistance wire is a nickel alloy.
3. Step 3. Nickel — is material for — Nickel–metal hydride battery. The cathode is nickel hydroxide.
4. Step 4. Nickel–metal hydride battery — uses — Electrochemical reaction. A chemical source.
5. Step 5. Electrochemical reaction — is used in — Lead–acid battery. A reversible reaction of lead and lead dioxide in sulfuric acid.

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