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        Q: What is the filament in lights?
A: because filaments is typically good conductors of heating , so the filament burn first and later gets heated up and later gives lighting . 

Q: WHAT IS a filament transformer?
A: A filament transformer is a machine that supplies filament forelectron tubes . There are several types of filament transformers . 

Q: What is filament coil?
A: A filament is coiled , since it will not receive power if it 's inthe form of a straight line . If a filament is uncoiled , solely asmall portion of this is gonna work .