How to select resistor value for LED with simple calculation (Ohm's Law)

In this video, I have explained how to calculate the resistance value for LEDs for different input voltage. It is very important to select right series resistor before using a LED in a circuit otherwise the LED may burnout.
I will request you to watch the complete tutorial video of the LED Resistor calculation but you can also jump to any topic by click on the following Time Stamps:
00:34 How to identify forward voltage, current rating of LED from datasheet.
00:54 How to calculate resistance value for 9V input voltage (Ohm Law).
02:21 How to calculate the resistor wattage in the circuit.
04:59 How to select the resistance value for 12V input voltage.
In this video, I have shown how to identify the LED rating from the datasheet and from that rating how to calculate resistance value and wattage required to connect the led in a circuit using ohm law for different input voltages. After calculation the resistance value we have practically measured the voltage and current value with a multimeter and compare it with the calculated data.
Here I have used a 3V led and calculated the resistance value in 9 volts and 12-volt circuit.
If you have enjoyed the video please hit the like button and share it with your friends. For more such videos don't forget to SUBSCRIBE our channel and please do share your feedback in comment sections. Thank you for your Support.
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[@TechStudyCell]

Hi! For Series and Parallel LED circuit Resistance calculation please refer the following video:
th-cam.com/video/H69xDuon7vo/w-d-xo.html

[@ahmedayaz1972]

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[@gadgets.cracker]

How much ohms resistor should i use in white led circuit of 6 leds and 9 volt battery .
3

[@ahmedayaz1972]

Gadgets Cracker *Use 1.5 watt 220 Ohms*

[@gadgets.cracker]

@@ahmedayaz1972 should i use 2 9 volts battery so that forward voltage will be of 18 volts. And then use 1 ohm 0.25 watts resistor to supply power to 6 white 5 mm leds.
Please help me.

[@AlphaCreativity001]

Tech StudyCell nice 👍🏼 video

[@c1tlr340]

This is exactly the video I've been looking for. Thank you

[@TechStudyCell]

You are welcome

[@muntazirmehdi3057]

@@TechStudyCell me also

[@KING4SNIPR]

When I start the video I forgot the time

[@mpxz999]

Very clear step by step instructions!
Thanks for the great examples!
I appreciate that you wrote down the calculations as you spoke :)
Thanks a bunch dude!

[@TechStudyCell]

Thanks for the feedback 😊

[@Randy2747]

Fantastic videos for a rookie like me, thank you for taking the time to make these videos! I'm in the process of watching all of your other videos 👍😉

[@TechStudyCell]

Thanks for your feedback...

[@fidztshuma1986]

BEST VIDEO for me, on this topic.... answering every question I ever had

[@TechStudyCell]

Glad it helped

[@fidztshuma1986]

@@TechStudyCell
i just realized I have another question

[@ACTSRevolution]

I was looking for exactly these calcs for a tiny DC motor application. I think this will only work for electronic loads and not any kind of resistive or power load, although a tiny motor seems like it must be purely inductive, I still cannot get anything to work for the motor. A finely organized and clear video. This should help me going forward as a noob.

[@fidztshuma1986]

perhaps you could also consider the wattage of the motor to choose the correct resistor with enough watts for the motor

[@rockytoptech1308]

Nicely done man! Good video. This will help many many beginners to electricity and ohm's law. 🤘🏽😎

[@TechStudyCell]

Glad it helped

[@GeniusHamid]

Very simple explanation. good job, Conguralation.

[@abenwinUT]

Excellent, informative video. Great detail but not overly complex. Audio very easy to follow.

[@TechStudyCell]

Thanks for your feedback...

[@farrukhsaeed100]

You are too good bady thanks for explaining the resistor measures.

[@camION4994]

Thank you for showing ohms law properly

[@omnisplash3041]

Simple and clear explanation. Thank you for such a great video

[@pra7nth]

Simplest way of teaching thanks a lot sir

[@laijugeorgh6348]

Explanation is very easy to understand 👌👌👌

[@TechStudyCell]

Thanks for the feedback

[@rajuthanakotty9036]

Only one video about resistor voltage drop and current limit across the resister excellent

[@ska757]

That is a really good explanation and you back it up with the practical scenarios.

[@bernhardnizynski4403]

Very clearly explained!

[@TechStudyCell]

Thanks

[@ssdravidian]

good simple explanation that i have been searching for ! thank you....keep going !

[@akashkhan9187]

Thank you, Thank you, Thank you..
I was looking for it...

[@TechStudyCell]

Welcome

[@mdavidf]

Excellent presentation, I really like the way you presented and explained everything!

[@TechStudyCell]

Thanks for the feedback...

[@kabandajamir9844]

The world's best teacher thanks sir

[@utkarshsrivastava5674]

Very nice explanation, this video cleared my doubts. Thanks a lot. Keep posting such videos.

[@TechStudyCell]

Thanks for your feedback 😊

[@tonysalarda1970]

thank you for your very specific and detailed explanation..i really learned a lot..thank youuuuuuuuuuuuu..

[@TechStudyCell]

You are welcome 😊

[@jimberry2967]

You made understanding this Math Very Easy and I appreciate Your doing so!!!
I'm just trying to make a few things with LEDs in them and I had No Idea how to figure out what resistor I needed to make a small lightning cloud using LEDs and a 9v battery.
Now I know!!
It's pretty obvious that I don't know anything about electronics but you made learning easy!!
Thanks Again and Happy Holidays!!

[@thandavamurthyg5766]

I expect this information from long time. Thank you sir

[@charshad5535]

Very good. sir 5V 2A ki sply hai or 1 Watt ki smd led light hai kitne ohm ki resistor chahiye?

[@prasuRangoli]

After searching lot of videos stuff. Finally find right one✨

[@ahmedsherbiny3505]

Thank you so much this video is so helpful

[@TechStudyCell]

Thanks for the feedback...

[@sushantKumar-qk2cn]

Best video on the internet 🙂🙃

[@TechStudyCell]

Thanks

[@AzizSayan]

I use 9V battery and blue LED with 10K ohm resistor , but the led burned , i can't understand why it broked , i try another circuit with 1k ohm and the same thing the Led burned , what is the problem?

[@rudygerona]

I like your calculations & the schematic diagram. Well illustrated & understood show.

[@TechStudyCell]

Thanks for your feedback...

[@RadioFixer]

Excellent video about the subject. Great job 👏👏👏

[@TechStudyCell]

Thanks

[@kayamotovlogph8554]

thank you for good and underdtandable tutorial,, God bless

[@TechStudyCell]

You are welcome

[@s.karthikeyan9978]

Thank you sir ,for a simple explanations. With detail experiment.

[@TechStudyCell]

You are welcome

[@a.rasheedh.m.aabidhrasheed6996]

I watch so much of videos but i cant understand but after watching your video i understand thank you

[@TechStudyCell]

Thanks for your feedback

[@donnytreure1213]

Thanks for this video.
How do you select the power(watt) for the resistors?

[@TechStudyCell]

Please refer the following video:
th-cam.com/video/GSlxkce1_ks/w-d-xo.html

[@donnytreure1213]

Thanks very clear answer👍.
In that video you need a resistor 22ohms bij 3,6Watt. Can you use for example 3x6ohm 1Watt and 1 resistor 4 Ohm 0,5Watt? All in serie

[@The_Absurdistt]

Excellent video. Does it matter if the resistor is placed at the anode of the LED? Or is it common practice to place the resistor at the cathode of the LED? What would be the reason for either? Cheers

[@rajendramore1683]

Good knowledge, better explanation, and best demonstration👌

[@TechStudyCell]

Thanks

[@carolecole1641]

Thank you for a great video, very well explained, kind regards Mike

[@TechStudyCell]

Glad it was helpful!

[@sheikhnadeemalam5813]

hi !! I am a newbie in electronics can you kindly explain why wattage calculation of a resistor is important...also in the video you said that we need to take a resistor of a higher wattage than 0.18W.. why so ??

[@TechStudyCell]

I have explained it in following video
th-cam.com/video/GSlxkce1_ks/w-d-xo.html

[@sheikhnadeemalam5813]

@@TechStudyCell O ! Just saw that video ! Doubt cleared...thanx!!

[@TechStudyCell]

Great 👍

[@abdurahimsalsalani7108]

Indian is the best teacher., Thanks sir

[@TechStudyCell]

Most welcome

[@nityanandasubudhi2167]

Nice explain.. this video solve my problem..👍

[@TechStudyCell]

Thanks

[@nityanandasubudhi2167]

@@TechStudyCell solar panel se mobile charger banado plz..

[@c.mdsalih]

Very helpful. Nice explanation. Thank you 👍

[@TechStudyCell]

Welcome

[@Columbariusify]

Clearly explained and useful

[@TechStudyCell]

Thanks

[@thebeybladearmory]

Does each LED need a resistor if wired parallel or just the first LED in the chain? Or do both wired parallell and wired in series need to have each LED have a resistor?

[@chetananam475]

A single resistance is also ok. We can connect multiple leds in parallel ( but of the same colour only). For different colour leds you have to use different resistor for every different colour .

[@Mr41627]

Very good teaching. No complexicity. thank u

[@TechStudyCell]

Thanks for the feedback 😊

[@pallabmondal7389]

Very nice. Very good. Kintu sir apni to DC voltage er khetre LED glo korar video dekhalen. But ac voltage er khetre LED glo korar jonno ki oi ekoi sistem a resistor valu korbo? Please ekta video dekhaben.

[@monaxp606]

In case I don't have the data of led....what should I do ? Actualy I want to use an AC led bulb by dc source (12v-35v) with same brightness by passing the AC to DC circuit in the bulb. I can measure voltage output from AC to DC circuit . I know the numbers of leds ( generaly in series). Now what ?

[@bhuveerchauhan4379]

Nice way of teaching

[@TechStudyCell]

Thanks..

[@rgodhnia]

Would you make vidoes using diodes
Its great to see videos with practical and theoretical examples like this channel

[@TechStudyCell]

ok. Thanks for the feedback

[@alvinkk2338]

Learn something from you thank you..

[@TechStudyCell]

Welcome

[@awwwwww530]

Very very thankful. Thank you so much ❤️.

[@TechStudyCell]

Welcome

[@awwwwww530]

@@TechStudyCell oh yeah

[@IIT2007]

Hi sir , i am giving 4.8v 700mah to the led of 3.3v then when I am dividing by your method i am geeting 2ohm is it right?

[@grdhingra4733]

Very well explained.

[@TechStudyCell]

Thank you

[@Deepunique]

valo presentation. jodi 9v battery diye 4led jalate chai tahole kato gulo resistor dobo r kivabe connect korbo?

[@muhammadrafiqulislamkhan6994]

You shoud be showed power rating here. P=VI is important as well as resistance and current ratings. Thanks for sharing.

[@TSulemanW]

Nicely Explaination . what if the current source is 20 A and the Voltage is 12 V is that equation still relevance. just asking. thank

[@TechStudyCell]

Yes. But the equation is for DC circuit.

[@vikramnayak420]

Sir UV lamp is 11 voltage ... And power supply 12 voltage if I supplied 12 voltage it's working or burn ... Which register is required for supply 11 voltage

[@muhammadrafiqulislamkhan6994]

simply sweet to delivery. Thank you.

[@Super_Natural_Power]

Hi nice video. May i ask if the temperature shud be any problem in this circuit. (resistors temp)

[@hareshpatel4474]

Sir I am Confuse to see your this video, in Series Parallel video LED 0.02 mA say and this video 0.03mA, Can you explain it, so my confusion is free. Thanks 🙏

[@loginzastrzezony]

Hi, I have a question. I would like to connect 44 LEDs (7030) with a voltage of 6 volts to a voltage of 220 volts or a 12v power supply. How can I do this?

[@physicsforallanniefreeda8909]

Clear explanation. Good.

[@TechStudyCell]

Thanks

[@mahanteshgidnavar0008]

Very nice explained.. Tq.. very helpful.. happy with your video sir

[@TechStudyCell]

Thanks for your feedback...

[@souravbhattacharyya3392]

Khub valo hoeche, 3 te 3 V LED parallel ey join korle duto common end ey 220 ohm, 1/4th W resistor lagalei hobe to 9 V battery lagale?

[@TechStudyCell]

If you use 9 volt battery then you can also connect the 3 led and a 27ohm ressitor in series.
Refer the following video:
th-cam.com/video/H69xDuon7vo/w-d-xo.html

[@Ridgerunner2270]

Okay, I have a question. I'm trying to power 4 LED's off two AAA batteries. what would be the best way to wire this? Would it be in parallel? The LED's are 3v and 20ma. Thanks!

[@TechStudyCell]

In parallel. (If the battery voltage is 1.5v)

[@Ridgerunner2270]

@@TechStudyCell thanks!

[@cristianpopescu78]

Great video! Thanks.

[@TechStudyCell]

Glad you liked it!

[@raghavendraraghav822]

Super more information send sir . Good teaching and good information tq

[@hey4641]

Is the I constant? If not, where did you get the 0.03 a?

[@TheMercuryraju]

Awesome bro your videos all of them are very useful to learn please doing different type of tiny switch fuction in pcb like TNY275pn etc.. Thanks

[@rctechmods8165]

But as the battery voltage gets low what will happen with led will it stays at same brightness or will it gets dimmer according to battery voltage please reply

[@kdgammingandtech3856]

great ... thanx for the information

[@TechStudyCell]

You are welcome

[@Jestunes]

Will lowering the voltage using a resistance lower the brightness of the diode? I've tried to do the calculations but my mind won't process the information. Help please!

[@shashiji27]

exilent presentation but what about 220 v ac and 3 v red led then resistor value?

[@gameplayandreview]

Next Video Request: How can we add led+resistor in a existing schematics?

[@mohammadorang-ojaboni4368]

thank you .i have lerned a lot.

[@francisdias9487]

Hello sir,
How many ohm resistor should I use for transperent white led and transperent red led with car battery which is 12volt to 14.4 volt.

[@TechStudyCell]

You can use 1k.

[@gurudevlakra9229]

Thanks u sir...great explanation...

[@mrinnovatorin]

sir how should we calculate the resistance if we connect more leds in parallel? Should we add the current rating of all leds?

[@sherwindy275]

Very clear explaination sir. Thank you.

[@TechStudyCell]

You are welcome

[@sohailsirajkl1]

I have a simple question over here,
for a simple led circuit to lighten it up.There are 2 ways for it to work
1, connect the 5v dc power source to a resistor and then to a anode of the led and then connect the ground to the cathode,
2,connect the 5v dc power source to the anode of the led and connect the cathode of the led with a resistor and then connect the resistor to ground,
in both ways the led gets lit up.Now this is kind of confusing for me .How does the current /voltage flow in this case since the led is being lit up in both the ways.Please answer this question .This question has been buzzing me for quite a while of time,

[@prasantatamuli6350]

Please describe the calculation if we have to connect multiple LEDs in series.

[@TechStudyCell]

Ok..in the upcoming videos.

[@samuelsamu633]

Thank you brother véry useful the lessons 3&4 RGB led how to Assemble.thankyou.

[@Super_Natural_Power]

whats temperature of tht resistor ?i ask same question 2years ago but no reply from you

[@allan6952]

Thank you sir !! Very clear, it really helped

[@TechStudyCell]

Thanks

[@HaveFaithInGod]

I have an LED bulb I removed from a "Finger Light" that was powered by three 1.5 volt hearing aid size batteries. There was no resistor in its set up, just a basic on/off switch. I want to install it in the nose of a toy drone that uses a 3.7 volt lipo battery. Do I even need a resistor added to this circuit? Just wire it pos and neg from the drones battery's circuit board terminals?

[@nomokvil2044]

Thank you very much! It was so helpful to understand more! and to make things more clear and assured for me! :) Thanks! keep explanations up!

[@TechStudyCell]

Thanks for the feedback...

[@seangholipour3884]

Can you use .5w instead of .25w resistor? Thanks

[@siddharthasingh9570]

How much ohm resistor should should we apply in a mini led bulb which u are using -?

[@willem878]

Thanks. It explained a lot to me.

[@TechStudyCell]

Welcome

[@MegaDonald09]

Hi thanks for the video. I have some question. If I have a power adaptor with 5V 1A, and a LED with 3V and 0.3A. understand I will need to use a resistor for 2V/0.3 around 6.6ohm. May I know what is the current in the circuit? Is it 0.3A or 1A as the adaptor say the output is 1A?

[@kennmossman8701]

0.3 A

[@roomrong]

Whether the resistor connected in parallel or series?

[@unobianconero5751]

wattage of curcuit or for a specific resistor should be considered? for 5v supply, 1w 3v led, the wattage for resistor is not 1w?? because the 0.3 apms from led in 3 volts is under 1w.
another question is can we run a 6v led on 5v usb supply? is it be on max brightness or even lighted up?
if we want a 1w resistor 56 ohms, can we use 4 1/4 14 ohms resistors in series?

[@kennmossman8701]

can we run a 6v led on 5v usb supply? NO must be Vf < Vs

[@kennmossman8701]

if we want a 1w resistor 56 ohms, can we use 4 1/4 14 ohms resistors in series?
Yes

[@AlexAlex-bh8fi]

Bro how many volts is your led mine is 3v then how many Amp have 25 or 30? Pls reply

[@sanu6891]

I have UV led whose specifications are :
Max forward current : 20mA;
Max reverse current : 50mA
Max forward voltage : 3.2V - 3.4V
Max power dissipation : 80mw
Max reverse voltage : 5V
What value of resistor is needed to glow if the Battery input is 12V 9ah.
Kindly reply.

[@your.free.electrons]

Extremely informative...
I was looking for such a video...
(Subscribed already)
:')

[@TechStudyCell]

Thank you

[@TheBinarydeity]

Good video. Keep up the fine work.

[@TechStudyCell]

Thanks

[@chrisdalrymple53]

Thank you. This was well presented.

[@TechStudyCell]

Thanks for the feedback 😊

[@ravikumar20062002]

Good explanation

[@TechStudyCell]

Thanks

[@198407ankur]

Sir 3v supply k sath konsa resistor lagega?