Large lead balls and transformer: what they have in common

1. Step 1. Large lead balls — is part of — Torsion balance. The attracting masses.
2. Step 2. Torsion balance — is made of — Silver. The suspension fibre is a thin silver wire.
3. Step 3. Silver — is material for — Control rod. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
4. Step 4. Control rod — is part of — Nuclear reactor. The rods control the power.
5. Step 5. Nuclear reactor — is part of — Nuclear power plant. The reactor heats the coolant.
6. Step 6. Nuclear power plant — has part — Transformer. Transformers step up the voltage so the plant's power can travel far.

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