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Question

The full form of LED is:

This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is Light Emitting Diode

Understanding the Full Form of LED

The question asks for the full form of the acronym LED. LED is a common electronic component used in many modern devices, from indicator lights to televisions and general illumination. Knowing the full form helps understand its basic function.

Analyzing the Options for LED Full Form

Let's look at the given options and determine which one correctly represents the full form of LED:

  1. Light Emitting Diode
  2. Lowlight Erecting Diode
  3. Light Editing Diode
  4. Light Erecting Diode

To answer this, one needs to recall the fundamental principle behind how an LED works. An LED is a type of semiconductor diode that emits light when an electric current passes through it in the forward direction. This process is known as electroluminescence.

Detailed Explanation of the Correct LED Full Form

Based on its function and composition, the correct full form of LED is Light Emitting Diode.

  • Light: It produces light.
  • Emitting: It releases or sends out the light.
  • Diode: It is a semiconductor device with two terminals (anode and cathode) that allows current flow primarily in one direction.

Therefore, an LED is essentially a diode that emits light when operated correctly.

Evaluating Incorrect Options

Let's consider why the other options are incorrect:

  • Lowlight Erecting Diode: This does not describe the function or nature of an LED. LEDs are known for emitting light, not "erecting" or specifically dealing with "low light" in this context.
  • Light Editing Diode: LEDs do not "edit" light. Editing implies modifying light in some way, which is not what a standard LED does.
  • Light Erecting Diode: Similar to option 2, this term does not reflect the operation of an LED, which is based on emitting light.

Only the term "Light Emitting Diode" accurately describes the device.

Summary of LED Full Form

The full form of LED is Light Emitting Diode. This name directly relates to its operation as a semiconductor diode that emits light.

Revision Table: Key Concepts

Acronym Full Form Basic Function
LED Light Emitting Diode A semiconductor diode that emits light when current flows through it.

Additional Information: What is a Diode?

A diode is a fundamental electronic component. It is typically made from semiconductor materials like silicon or germanium. A diode has two terminals, an anode and a cathode, and acts essentially as a one-way switch for electric current. It allows current to flow easily in one direction (the forward direction) but strongly restricts current flow in the opposite direction (the reverse direction).

In an LED, this diode structure is specifically designed using materials that emit photons (light particles) when electrons and holes recombine within the semiconductor material under forward bias.

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Similar Questions

  1. An optical fiber is a cylindrical dielectric waveguide that transmits _____ along its axis.

  2. Which among the following is used as receiver in fiber optic communication?

  3. Which one of the following is a photo-voltaic module?

  4. Pulses of Light are used in _____ for communication system to transmit information.

  5. The _______ is a device that is able to sense light levels and alter the current flowing between emitter and collector according to the level of light it receives.

  6. Solar panels convert sun light into electricity based on the principle of _______.

  7. _______ is an application of electronic devices and systems that source, detect and control light.

  8. A _______ is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

  9. Generation of light in LED is based on which principle?

  10. An opto-coupler provides _______ between the input circuit and output circuit.


Important Questions from Opto Electronic Components

  1. An optical fiber is a cylindrical dielectric waveguide that transmits _____ along its axis.

  2. Which among the following is used as receiver in fiber optic communication?

  3. Which one of the following is a photo-voltaic module?

  4. Pulses of Light are used in _____ for communication system to transmit information.

  5. The _______ is a device that is able to sense light levels and alter the current flowing between emitter and collector according to the level of light it receives.

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