Power rails and joystick: what they have in common

1. Step 1. Power rails — is part of — Breadboard. Lengthwise strips for power.
2. Step 2. Breadboard — is made of — Nickel. The contacts are nickel-plated bronze.
3. Step 3. Nickel — is material for — Potentiometer. The resistance wire is a nickel alloy.
4. Step 4. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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