Amperímetro y escudo de túnel: qué tienen en común
- Paso 1. Amperímetro — utiliza — Corriente continua. In a school circuit the ammeter shows the direct current from the battery.
- Paso 2. Corriente continua — se utiliza en — Inversor. An inverter turns a battery's direct current into alternating current.
- Paso 3. Inversor — tiene como parte — IGBT. The power switches of inverters.
- Paso 4. IGBT — forma parte de — Locomotora eléctrica. Traction converters.
- Paso 5. Locomotora eléctrica — se utiliza en — Metro. The first lines were steam-operated; electric trains since 1890.
- Paso 6. Metro — utiliza — Escudo de túnel. Metro tunnels were built with shields.