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

Question Posted / rafiway

3 Answers
6171 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 are the advantages of load commutated chopper?

0 Answers

Explain what is an fpga?

0 Answers

What is race around condition in a jk flipflop? How it can be avoided?

0 Answers

Explain how to measure frequency without cro?

0 Answers

We have 6.6 KV, 250 KW HT Motor and i want to run this motor with 250 KW LT Variable frequency drive. Is this Possible? How? what are the major modification required?

0 Answers

Void main() { If(printf("C") && getch ()) } Then output is C. If I wrote clrscr() in the place of getch() then it gives error message why..

1 Answers

what is the function of DVJA card in Nokia BTS &how it work

2 Answers TNS,

I heard that Apple's laptop usese micro controler whereas others use microprocessors... i learnt tat.. micro controller is nothing but an association of microprocesor with other elements like temperature sensor,timer etc...can anyone explain me this much more in simpler words...

0 Answers

no of comparators in flash converter.

2 Answers ONGC,

Explain the difference between dcs & plc & scada?

0 Answers

Desktop comes in which layer?...

1 Answers Cisco,

16:16::25:? A]25 B]16 C]32 D]1

2 Answers Bhel, MahaGenco, Syntel,

For more Electronics Communications Interview Questions Click Here