During the start-up of the circuit shown in...

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Question 1 of 2066636eed28f7522a1c51dbe1

During the start-up of the circuit shown in figure "B" of the illustration, it is noted that the ends of component "4" remain lighted but the tube does not illuminate. What is likely the cause of this problem? Illustration EL-0081

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Question 1 of 20

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🔍 Key Concepts

• Operation of a preheat fluorescent lamp circuit (ballast, starter, and tube) • Role of component 5 (starter) in heating the cathodes of component 4 and creating the high-voltage kick • Effect of an open ballast (component 3) versus starter contact problems on lamp behavior

💭 Think About

• When the ends of the fluorescent tube (component 4) glow but the tube never strikes, which component is still supplying current to the filaments but failing to create the starting voltage? • Would an open ballast (component 3) allow any current to reach the tube ends? Why or why not? • What must happen to the contacts in component 5 during normal start-up, and what visible symptom would you see if that never happened?

✅ Before You Answer

• Verify which component in figure B is responsible for the inductive kick (high-voltage pulse) needed to start the tube. • Check whether a stuck-closed vs. stuck-open condition in component 5 would cause the tube ends to remain lit continuously. • Confirm that a wrong-wattage tube (component 4) would or would not typically keep only the ends glowing without ever striking.

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