Power amplifier stage and petri dish: what they have in common

1. Step 1. Power amplifier stage — is part of — Hi-fi amplifier. Power transistors drive the speakers.
2. Step 2. Hi-fi amplifier — has part — Heat sink. Radiators carry away heat.
3. Step 3. Heat sink — uses — Heat transfer. Heat dissipation.
4. Step 4. Heat transfer — is used in — Pasteurization. The product is heated to 60–70 °C.
5. Step 5. Pasteurization — uses — Germ theory of disease. Killing microbes with heat.
6. Step 6. Germ theory of disease — is used in — Petri dish. Growing bacterial cultures.

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