Toaster and centrifugal pump: what they have in common

1. Step 1. Toaster — has part — Bimetallic strip. The timer of many toasters is bimetallic.
2. Step 2. Bimetallic strip — is part of — Hair dryer. Overheating protection: when hot, a bimetallic strip bends and breaks the circuit.
3. Step 3. Hair dryer — has part — Impeller. An impeller on the motor shaft pushes air through the heater.
4. Step 4. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.

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