Thyristor e needle: o que têm em comum

1. Passo 1. Thyristor — evoluiu de — Diodo. A controllable counterpart of the diode with a four-layer structure.
2. Passo 2. Diodo — evoluiu de — Vacuum tube. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
3. Passo 3. Vacuum tube — inclui — Iconoscope. An electron tube.
4. Passo 4. Iconoscope — é feito de — Silver. The target is a mosaic of silver grains with caesium.
5. Passo 5. Silver — é material para — Syringe. Early needles were silver.
6. Passo 6. Syringe — tem como parte — Needle. A hollow needle.

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