Digital thermometer and joystick: what they have in common

1. Step 1. Digital thermometer — has part — Thermistor. A thermistor.
2. Step 2. Thermistor — is a kind of — Resistor. A resistor.
3. Step 3. Resistor — includes — Potentiometer. A variable resistor.
4. Step 4. Potentiometer — is used in — Joystick. Position is read with potentiometers.

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