The accompanying figure shows a preheat fluorescent lamp with an autotransformer-type ballast. Explain what the autotransformer-type ballast does and how it works.
What will be an ideal response?
The autotransformer-type ballast increases the voltage, which is required for preheat fluorescent lamps with a wattage of 30 watts or greater. The 120-volt input is applied to the section of the coil fed by the black and white line wires. The other section of the coil steps up the voltage output to the tube so that the tube starts conducting at the end of the preheat period. After the tube is operating, this section of the ballast acts as a series reactor to limit the current to the rated value.
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What will be an ideal response?