some times electric bulb does glow even when electric switch is (No) then we say that bulb is
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fused
it happens when the tungeston wire breaksup or melts down .
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in contrast to incandescent bulbs or halogen lamps an LED lamp has a high resistance due to the integrated power supply unit. The serial connection of the glow lamp closes the circuit even when the switch is turned off. As a consequence a low voltage drop appears to the LED driver so the LED still lights up weakly.
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