Nickel and radio: what they have in common

1. Step 1. Nickel — is material for — Potentiometer. The resistance wire is a nickel alloy.
2. Step 2. Potentiometer — is part of — Electric guitar. The volume and tone knobs on an electric guitar are potentiometers.
3. Step 3. Electric guitar — has part — Amplifier. An amplifier.
4. Step 4. Amplifier — is part of — Radio. Amplifying a weak signal.

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