Transistor and nuclear reactor: what they have in common

1. Step 1. Transistor — is part of — Hi-fi amplifier. Amplification comes from transistors or tubes.
2. Step 2. Hi-fi amplifier — has part — Transformer. The power supply is a transformer.
3. Step 3. Transformer — is part of — Nuclear power plant. Transformers step up the voltage so the plant's power can travel far.
4. Step 4. Nuclear power plant — has part — Nuclear reactor. The reactor heats the coolant.

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