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Q100 (IAS/2000) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

Fluorescent tubes are fitted with a choke. The choke coil

Result
Your answer: —  Â·  Correct: C
Explanation

In fluorescent tube circuits the choke (ballast) is an inductive device whose primary role is to limit the current through the lamp once the discharge is established. Ballasts/chokes prevent the lamp from drawing excessive current (a near-short when ionized) by providing inductive impedance at mains frequency, thereby reducing and stabilizing current flow [1]. During starting, ballasts can help produce the higher voltage needed to strike the arc, but after ignition they restrict current to safe operating values; electronic ballasts similarly produce a high starting voltage and then regulate/limit current during operation. Thus the choke’s key function in traditional tube fittings is current limitation rather than stepping down line voltage or filtering low-frequency currents.

Sources

  1. [1] https://edisontechcenter.org/Fluorescent.html
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