What are the different ways to check LED light/bulb?

Question Posted / rafiway

3 Answers
5914 Views
Infosys, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

What are the different ways to check LED light/bulb?..

Answer / aziz

1. By using multimeter.
2. By Continuity tester.
3. Battery.
4. DC adapter.
5. By AC current with resistor.

Is This Answer Correct ?

16 Yes

1 No

What are the different ways to check LED light/bulb?..

Answer / guest

Check using battery

Is This Answer Correct ?

6 Yes

6 No

What are the different ways to check LED light/bulb?..

Answer / chary

1. LED polarity can be checked by observing the terminals
usually longer lead is positive.
2. LED can be tested by Multimeter (digital or Analogue)
DMM should be kept in diode test mode by observing the
polarity .
meter indicates the drop ( !V to 2.7 V) depending on LED
colour . whem terminals are reversed should not indicate.
this confrms LED is good
3.When using analog multimeter keep range selector in
lowest Resistance range . in analog multimeters in
resistance mode the -ve or black wire should be treated as
+ve lead
4. LED can also be tested by connecting it to a 3v Battery /
AC adapter with a resistor(1K to 10K )connected in series

Is This Answer Correct ?

1 Yes

1 No

Post New Answer

More Electronics Communications Interview Questions

What is a demultiplexer?

0 Answers

How do the transition region width and contact potential across a p-n junction vary with the applied bias voltage?

0 Answers

what is antenna?

21 Answers Idea,

plz send me the website of dmrc for previous questions papers

0 Answers DMRC,

Although zener diode is operated in the reverse breakdown region, but it does not burn. Why?

0 Answers

please send previous years question papers of JuniorEngineer (ELectronics)in RRB.

0 Answers

what is d difference between digital image processing & digital signal processing?

2 Answers

What is the difference between a multiplexer and encoder? Also what is the between demultiplexer and decoder?

0 Answers

hai,i am apply 4 AAI Jr.Executive(ATC) & Electronics plz send me the model question papers. with regards, a.m.senthil kumar e mail ID:kumar.sen@sify.com

20 Answers AAI Airports Authority Of India, College School Exams Tests, GP, NMBM,

Why are ics more reliable than discrete circuits?

0 Answers

When the two inputs of a multiplier are connected together, the device operates as a A Voltage doubler B Square root circuit C Squaring circuit D Averaging circuit

0 Answers

Why series inductor and l-section filters cannot be used with half-wave rectifiers?

0 Answers

For more Electronics Communications Interview Questions Click Here