Voltmeter and refrigerator: what they have in common

1. Step 1. Voltmeter — has part — Resistor. The series resistor gives the voltmeter a high resistance so it barely draws current from the circuit.
2. Step 2. Resistor — includes — Thermistor. A resistor.
3. Step 3. Thermistor — is part of — Multicooker. A temperature sensor.
4. Step 4. Multicooker — evolved from — Rice cooker. A multicooker.
5. Step 5. Rice cooker — has part — Thermostat. Switching off by temperature.
6. Step 6. Thermostat — is part of — Refrigerator. A thermostat.

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