Phone line jack e transformer: o que têm em comum

1. Passo 1. Phone line jack — faz parte de — Modem. Connection to the telephone line.
2. Passo 2. Modem — utiliza — Telephone. It works over a telephone line.
3. Passo 3. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Passo 4. Electrical telegraph — tem como parte — Fio de cobre. Communication lines.
5. Passo 5. Fio de cobre — faz parte de — Transformer. Windings.

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