Question
Download Solution PDFWhat is the forward voltage of LED?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it.
- The forward voltage of an LED, VF, is the voltage that must be applied across the leads of the LED, from anode to cathode, in order for the LED to turn on.
- Typically, the forward voltage of an LED is between 1.8 and 3.3 volts.
- It varies by the color of the LED.
- A red LED typically drops around 1.7 to 2.0 volts.
- Since both voltage drop and light frequency increase with band-gap.
- A blue LED drops around 3 to 3.3 volts.
Last updated on Jul 16, 2025
-> The Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article.
-> RRB has also postponed the examination of the RRB ALP CBAT Exam of Ranchi (Venue Code 33998 – iCube Digital Zone, Ranchi) due to some technical issues.
-> There are total number of 45449 Applications received for RRB Ranchi against CEN No. 01/2024 (ALP).
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.
->The candidates must have passed 10th with ITI or Diploma to be eligible for this post.
->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.
-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways.
-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.
-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here