Rotor e barril: o que têm em comum

1. Passo 1. Rotor — faz parte de — Electric generator. The rotating part with a magnetic field.
2. Passo 2. Electric generator — faz parte de — Power station. Generators produce the current.
3. Passo 3. Power station — é feito de — Tijolo. The buildings of the first power stations were brick.
4. Passo 4. Tijolo — é material para — Arco. Arches were built of brick or stone.
5. Passo 5. Arco — funciona como — Barril. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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