ROM and watt steam engine: what they have in common

1. Step 1. ROM — has part — Transistor. Cells.
2. Step 2. Transistor — is part of — Hi-fi amplifier. Amplification comes from transistors or tubes.
3. Step 3. Hi-fi amplifier — has part — Transformer. The power supply is a transformer.
4. Step 4. Transformer — is part of — Nuclear power plant. Transformers step up the voltage so the plant's power can travel far.
5. Step 5. Nuclear power plant — has part — Steam turbine. Steam turns the turbines — as at a thermal station.
6. Step 6. Steam turbine — evolved from — Watt steam engine. The turbine replaced piston engines in large installations.

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