What are the different ways to check LED light/bulb?
Answer Posted / 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 View All Answers
What are the poles of alternators made of?
send me cutoff of surat nit for m.tech
how a log ratio amplifier works?
Tell me why the feeding frequency to a microprocessor is twice the operating frequency?
explain construction of lvdt?
What is cdma, tdma, fdma?
Explain the use of excitation table in digital electronics?
send me test pattern of nsn?
hI, I AM A BE GRADUATE. WILL U LET ME KNOW WHAT TYPE OF OFFICER POSTS ARE AVAILABLE FOR MY QUALIFICATION IN SBI BANK? WHETHER THERE ARE ANY SCALE OF PAY DIFFERENCE FOR THE REST OF THE OFFICER POST AND THE POST THAT IS UNIQUE FOR ENGINEERS?
pls send me the syllabus questions on rrb section engineer (telecom)
sir, please send me RRB Question papers for Section engineer Signal..
Explain the construction and application of a jfet.
What is ascii in reference to electronics?
What is the ratio of majority and minority carriers in intrinsic and extrinsic semiconductors?
What is the magnetic susceptibility of a paramagnetic material?