Question

Short answer of when is an electric bulb said to be fused

Answer 1

Electric bulb is said to be fused when the tungsten filament breaks which is present in bulb.As the filament is broken the bulb doesn't glow.

The filament in bulb is made up of tungsten metal.

Answer 2

when the filament of electric bulb is broken the bulb is said to be fused.
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