How a ballast give high voltage?
Answer:
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A ballast doesn't give high voltage.
A step up transformer or inverter is used to increase the voltage. This is used to drive florescent and neon bulbs which require high voltages to operate..The bulbs have a problem. They have a negative coefficient of resistance. This means that when the device gets warm from use, the resistance goes down. This causes the heat to increase and the resistance to go down more. The process continues until the current is limited or the device is destroyed.
The Ballast comes in. It has a positive coefficient of resistance such that it curbs the problem with the bulb. This means that the ballast's resistance increases more than the bulbs decreases meaning that the current stabilizes. Does this mean the ballast will get hot? No necessarily. Ballasts don't actually use pure resistance. They store the energy and release it back into the circuit but keeping the current in check.
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