**DISCLAIMER - READ BEFORE WATCHING** I am an electronics hobbyist; I do not have a degree in electrical engineering. This series MAY NOT teach all of the appropriate safety required for general electronics work. Any advice taken from this series should be checked with multiple sources, and a professional should be addressed to ensure proper safety.
RU-vid has taught me more on several subjects than school ever did. Your videos are one of those reasons. Easy to get into, informative, well presented, with visual aids. Loving these videos, dont ever stop.
Very true. It boggles my mind looking back how school did not teach us things we'd encounter every day such as electronics, but makes us learn physics, chemistry, etc. You want electronics? Go to vocational school. LOL!
When I was little, I used to tinker with nerf guns and see how far I could get them to shoot. Around the time I really got into doing that, they came out with a few semi-automatic ones that used motors to propel the darts like a ball pitching machine. I got a couple of those to see what I could get out of them, not knowing much at all about electronics. They took about 4 AA batteries each. I decided to hook up 2 9 volt batteries to one and burnt out the resistors for the motors. After those burnt out, I just wired the motors without them. They made one hell of a noise and shot really far until I burnt them out. Afterward, I used motors from a different model nerf gun with the same configuration (no resistors) those one's never burnt out and still shot as far. I also wired in my own power switch, since the original was a button you had to hold down. Only vaguely related to the video, but I figured someone might get a kick out of the story
Get the Nerf Nuke. Here's another fun story, I googled how to make a nuclear bomb and it said I needed to start with calc-based physics. However, the FBI and teachers were concerned because, back in those internet days that was worse than googling R-rated movies. It put me on a watch list until 9/11 happened and they had more important things to do. From here I deduce that learning calc-based physics will put you on a watch list.
Thank you, man. I am a university technical English instructor working in Germany, and next term I will need to teach the Electrical Engineering students some subject-related English. I had no idea of any electronics, so these videos are tremendously helpful for me to create decent lessons that won't bore these people to death!
Thank you for doing a well illustrated tutorial Being Dyslexic and its getting worse with old age, I personally struggle with books and putting knowledge from such into practice. And so from watching this tutorial, I do now understand and now it seems simple. This old dog has learned a new trick so to speak :)
Been wondering how to get into electronics.. I work in an R&D company but I only do the mechanical side of things, housings, brackets etc.. I already "know'' by experience on the workplace alot of the stuff you are explaning, but only as seperate pieces of information. Your videos are really helpfull into letting all of it come together and make sense :) Thanks alot!
lol you know ive been trying to find a video like this for years. Like maybe at least 7 years. That formula makes so much sense to me. It finally clicked in my head and now I finally understand how and what the goal is on designing a circuit. I am forever grateful thank you. I swear ive looked so hard for an easy explanation and I never could find it.
Just a slight clarification for those who are struggling to get the forward voltage part: forward voltage more or less means how much energy the diode uses up. Forward voltage is how many less volts we'll have in the circuit after the diode, as opposed to before it. So to find out how much voltage we have in the circuit as a whole, we need to subtract that number from the source, or else we would be overestimating. This also mean that if we have more than one LED (or other component), all we have to do is plug in their forward voltage into the equation, and it will tell us how much less resistance we need.
So, if I'm understanding this correctly, let's say we have a 9v battery and three LEDs that take up to 3v each. Would using all three LEDs in a circuit eliminate the need for any resistors? And would having a fourth LED cause them all to glow less brightly due to the shared voltage being more spread out?
Thank you for sharing your knowledge. Deeply appreciated! I'm a Linux user and I love the idea of sharing knowledge for the betterment of mankind and technology...
I really like how you instruct. This tutorial series is simple and clear, and that's exactly what people like me need. Thank you for all your hard work and efforts. You are awesome sauce!
I am on lesson 8 now and your material is sooooo good! This knocks spots off of the way that they teach at college, I know as that is where I labouriously learned in a year what I could have learned in 6 weeks with the proper method of teaching.
I work as a journeyman in the commercial and residential electrical field. I know nothing of electronics and I'm seeing applications in my field that, if I knew basic electronics, this will take me much farther in my career. Fun videos.
Thank you man!! This is amazing, honestly, I spent years at school understanding NOTHING about electricity because all we get is a diagram and I didn't even know what most things even meant in it. in English (since I am foreign and study in a UK school), and the way for me to learn is to understand how everything goes together, and you showing us everything and explaining is literally all I need to learn stuff like that, it's sad that schools don't really always teach us like that.. but thank you!!
You have the best tutorials on electronics, you explain very well and easy to understand, and you cover the important things, you're amazing. Liked and subbed 🖒🖒
very good I am happy to see your video . I don't know how much resistance use in Ckt. my request please prepared video for how much capacitor, transistor, diode, resistance rating use in circuit.
When you have a resitor of say, 100 ohm, that is too low. Can you put two resistors after eachother to get already 200ohms? I am a total novice to it. Just thought about this during you said 100 ohms is too low.
Yes. If you add resistors in series (one after another) you can combine their individual resistances together to get a total resistance value. 120 + 120 = 240 ohm. Two resistors of 120 ohms combined together in series are equivalent to (or the same as) one resistor of 240 ohms.
what if we are using 1k resister which ~4 times of required one, would it blow the LED or if we use 100 resistance which is less then half, I am bit confused on if 240 is blocking or 240 releasing. which case would release more current ?
Bro, this series tutorial on basic electronics is really great! This would help me a lot in taking my Physics 2 class next week. Have to finish this series before our first class starts 🤣 thank you very much! God Bless you!
What if the forward voltage has a range, or is higher than the power source? Ex. I'm using 3V to light a 3.0-3.2V green LED. Depending on which value I use, my required resistance ends up being 0 or negative - so no resistor is needed?
Lower is only bad if it's too little to run the component. No resistor needed, if it doesn't work, you need higher voltage. This might be a bit late for answering this question, but maybe someone else with the same question will see this.
I am a Mechanical Engineer, Trying to learn Electronics, Thanks a lot for your information.. i have 1 one doubt.. resistor can be connected to cathode or anode of LED ???
I am using 2 AA batteries. I got a electronics starter kit with absolutely no information about the LED. I am going to use the same numbers as you. But if I have 3 volt power source, I would get a negative number
Sometimes you do not need to add the forward voltage. I just did the same thing for a small motor and there was no Forward Voltage specified so I guess its only for LED's?
*Summary:* - some electrical components (e.g. LEDs) can only handle so much current going through them, any more and they will be damaged - you know how much voltage your circuit has, but how much resistance should you add to the circuit to ensure that the LED (or other sensitive component) does not get damaged? - use this formula: (circuit_voltage - component_forward_voltage) / component_current
In your example, you said something like, "What if you only have a 100 ohm resistor . . ." so I'm wondering, can you wire two resistors in sequence to create, in effect (in this example), a 200 ohm resistor?
If we have a data sheet that shows forward voltage type (example: 1.7) and forward voltage max (example: 2.2), I take it we go by type (1.7) to work out the resistance? and Steady current (example 30 mA) would be for Amps(0.03 amps)? The component I'm looking to use is a 3 bit 7 segment led display and the power source is a 1.5 volt AAA battery
For this resistance example of 240 ohms, what would be a minimum and maximum cut off value for the amount of resistance? Like how much would be too much resistance and how less would be too little resistance..?
Just curious... Let's say you have a 24v power source and you want to power a gadget or let's say a laptop with a forward voltage of 19v; Would the laptop work by adding a resistor to the 24v power source?
Hello, thank you for your lessons. But I do have a question. What if I need a resistor for 240 oms but I have only two resistors for 120 oms could I put them all in one current and would they sum up?
I have a power source of 19.5 and amps of 6.7. There is no known forward voltage differential as the power is moving into a coil of copper wire. So if i divide it all out, I end up with about 3 ohms. My question is in regard to the watts that are being put out which is about 130 watts. When choosing a resistor, do I take the wattage output into consideration and if so, how do I calculate that in?
I love your videos, I had one question if you don't mind. let's say you wanted to hook up another LED or some other component after the current passes through the resistor and the light. If it continues down the wire does it remain at the changed voltage or does it rise again? I hope I worded that right.
Im watching your videos to brush up/from scratch electronics, I have a light led fixture and its toooo bright but I want to dim it down but tge power supply is not dimmable so I thought I was smart so I figured how much voltage could it be on the load side 100-150vdc yikes, so know im trying to find a way to dim it after the power supply I was thinking to just put a ristor or potentiometer but is it really that simple
if I wanna add this is a car what voltage should I use a 12vwhen the car is off or 14v when it's on and what about the power of the resistor doesn't it matter.
Don't we need to consider power source's output power? Doubt: if we have 2 sources S1 & S2. S1 = 9v/1A S2 = 9v/2A Then also we need the same resistance to work with same LED.
There's a problem here for many of us, I buy those little plastic boxes of mixed LEDs of various colours from the likes of Amazon and although it tells you on the lid the forward voltage there is no mention of how many amps each colour LED uses. So what do you do in those circumstances??
what about the amps of the power supply ay i have a 12 v dc power supply which boasts of a 1 am current ho are we going to incorporate that in calculating the resistance required please guide
why is no one answering this question? i read every single comment and a bunch of people are asking this. if i have a 9v battery pushing way more current how does that factor in? youd obviously need much higher resistance, but this part is nowhere in the formula and i cant find an explanation for this anywhere. how can the current of the power source be totally ignored when calculating resistance?
So if I have a power supply that pushes 30v and 10amps dc right. and my device wants 30v and 1.3 Amps .How do i stop it from drawing 5amps at 30v? because it gets hot and starts to draw more and more . Than it sends more amps because of heat. I can cool it and it helps alot. But the problem is still there how do i stop it from drawing more amps as it heats up?
why is no one answering this question? i read every single comment and a bunch of people are asking this. if i have a 9v battery pushing way more current how does that factor in? youd obviously need much higher resistance, but this part is nowhere in the formula and i cant find an explanation for this anywhere. how can the current of the power source be totally ignored when calculating resistance?
Out of curiosity, would you be able to compound resistors to equal 240 ohms? For example, use two 100 ohm and one 40 ohm resistors. I'm sure this isn't optimal but if you had to is it possible? If not, why is that?
