Which component collects AC from overhead wire?

Which component collects AC from overhead wire?

• A. Pantograph
• B. Third rail shoe
• C. Transformer
• D. Rectifier

Answer: (A)

Current collection from overhead lines is done with a pantograph. This device sits on the train’s roof and uses a spring-loaded arm with a carbon contact strip to press against the overhead conductor, continuously drawing AC power as the train moves. The energy then enters the train’s electrical system for conversion and use. The other options don’t perform the collection role: a third rail shoe gathers power from a ground-level rail in third-rail systems, not from overhead wires; a transformer changes voltage within the train, not how power is collected; a rectifier converts AC to DC after collection, not the act of collecting energy from the wire.

Current collection from overhead lines is done with a pantograph. This device sits on the train’s roof and uses a spring-loaded arm with a carbon contact strip to press against the overhead conductor, continuously drawing AC power as the train moves. The energy then enters the train’s electrical system for conversion and use.

The other options don’t perform the collection role: a third rail shoe gathers power from a ground-level rail in third-rail systems, not from overhead wires; a transformer changes voltage within the train, not how power is collected; a rectifier converts AC to DC after collection, not the act of collecting energy from the wire.