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Question

The thin wire that gives off light in an electric bulb is called ______.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
filament

Electric Bulb Filament Identification

The component in an electric bulb responsible for producing light is a thin wire known as the filament.

When electric current passes through this wire, it heats up to a very high temperature and glows, emitting light. This process is called incandescence. The material used for the filament needs to withstand these extreme temperatures, which is why tungsten is commonly used.

Analyzing Other Options

  • Fuse: A fuse contains a wire designed to melt and break the circuit if the current exceeds a safe level, preventing damage. It does not produce light.
  • Relay: A relay is an electrically operated switch used to control another circuit. It does not produce light.
  • Resistor: A resistor is a component used to impede or resist the flow of electric current, often to control voltage or current levels. It does not produce light intentionally, although some may generate heat.

Therefore, the correct term for the light-emitting wire in an electric bulb is the filament.

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