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In fluorescent tubes, ballast resistance is connected in series with the choke

  • In fluorescent tubes, ballast resistance is connected in series with the choke when tube operates on dc supply.
  • When operating a fluorescent tube on a DC power supply, a ballast resistance is connected in series with the choke.
  • This is done to regulate the current flowing through the tube.
  • The ballast resistance, which is typically a high-wattage resistor, is used to limit the current flow through the tube.
  • Without the ballast resistance, the current flowing through the tube could become too high, which could cause the tube to overheat and fail.
  • The choke, also known as an inductor, is used to smooth out the current flowing through the tube.
  • Without the choke, the current would be erratic and could cause the tube to flicker or fail.