Resistors - The Learning Circuit
Ғылым және технология
Karen explains what resistors are, how resistors are represented on a schematic, various types of resistors, and the characteristics of those resistors. She’ll go over carbon composite resistors, thin film resistors such as carbon, metal, and metal oxide film; thick film or cermet resistors; wire round resistors; variable resistors such as thermistors, potentiometers, and photo or LDR resistors; SMD resistors; trimmer pots; and more. Visit The Learning Circuit: bit.ly/2ObFF9h
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According to Ohm’s Law, in every circuit there is a balance between voltage, current, and resistance. Most electrical components require a certain voltage and current to function properly. By adding resistors, you can control the voltage and current in various parts of a circuit. Resistance in an electrical circuit is when a material prevents some or all of the electrical current from flowing through it, converting that restricted energy into heat. Every material has some resistance. In resistors, this principle is used to create a controlled amount of resistance that can be used to regulate circuits. Resistors can be made of a variety of materials. Carbon composite resistors are made by combining a conductive material, usually finely ground carbon or graphite, with a non-conducting material like ceramic. Once widely used, they have mostly been replaced by more efficient and precise resistor types. While cheap to produce, their lack of use means they are often more expensive. Carbon film, metal film, and metal oxide film are examples of thin film resistors. Thin film resistors are generally made by depositing a conductive material onto an insulating ceramic rod or substrate. A laser trimmed pattern is cut into the film in order to increase its conductive or resistive path. The resistance value is controlled by varying the thickness of the film. Thin film resistors are the most common type of through-hole resistors. Surface mount resistors are created using the same method as thin film resistor. Surface mount resistors feature relatively high tolerances, low temperature coefficients, low noise, and work well in high frequency applications.
Another type, thick film or cermet, uses a paste combining ceramic and metal; designed to have the optimal properties of both materials. They have good temperature stability, low noise, and good voltage ratings but have low surge current properties. This method is most commonly used to make potentiometers and surface mount resistors. Wire round resistors are made with wire, with higher than normal resistance. This gives them a high level of reliability and comparatively low level of temperature coefficient, making them well-suited to handle high powers. Given the size of the wire used to make them, they tend to be quite large. They are often used in circuit breakers or as fuses.
Depending on your circuit, you don’t necessarily have to have a resistor that’s the exact value you want. Often, you can get away with a resistor that’s just close to your desired value. The temperature coefficient gives you the amount of resistance change that occurs when the temperature of the resistor changes. The size of the resistor is often relative to its power rating in watts. If you need a resistor that can handle a lot of power, you’re likely stuck with a larger resistor. If you’re working with low power circuits, you have a lot more options. SMD resistors have gotten so small, it's not a question of how small a resistor you can get, but how small of a resistor you can solder to your board reliably. Not all resistors have fixed values. Variable resistors have a maximum resistance and can be adjusted to have a resistance between 0 or near zero and their maximum resistance. Some respond to environmental stimuli such as flex sensors that bend, force sensing resistors that respond to pressure, thermistors that respond to heat, and photo resistors or LDRs that respond to light. There are others that respond to moisture, gas, and other environmental stimuli. The most common variable resistors are potentiometers. Inside, potentiometers have a band of resistive material. The control shaft connects to a wiper that contacts the resistive band and rotates, varying the amount of resistive material between two leads. Another type of potentiometer is a trimmer pot, also known as trim pots or presets . Trimmer Pots, also known as trim pots or presets, are a type of potentiometer that are normally mounted on PCBs and adjusted by using a screwdriver. They are meant for occasional tuning and calibration. Rheostats are similar to potentiometers except they are mostly constructed as wire round resistors. The wiper moves back and forth along the wire coil to vary the amount of resistance.
Пікірлер: 116
Damn you guys went hard on resistor basics! Four years of electrical engineering and the E-series was never explicitly explained to me before... lol Nice to finally have that sorted.
@scotttovey
5 жыл бұрын
Justin Lee - Isn't it annoying that no matter how high the cost of education becomes, you have to wait for a free KZread video to give you the information that should have been included in the course?
@mirabilis
5 жыл бұрын
10 12 15 18 22 27 33 39 47 56 68 82 :)
I've worked with resistors before, but never really looked into the institutional knowledge and expanded data information you presented here. Thank you Karen!😊
Thanks Karen! Brings me back to my old physics labs during freshman year of college. Nice to see more women in the field. You're amazing!
I like these learning circuit videos, because while most I the topics I already understand they serve as a refresher and often cover details I'm not aware of (like resistor series). And who hasn't cooked a resistor and let out the magic smoke at least once? ProTip: turn on your bench supply before connecting your circuit so you can adjust it without sending 12V 3A across a tiny resistor.🔌⚡🔥💨
Thanks Karen. Looking forward to capacitors and inductors...Already missing the Ben Heck Show but this series looks great..
Love your videos Karen, awesome job and so informative!!!
I didn't get this much information on resistors in the electronics course I took. Great video Karen.
@jonasjohnathan6074
2 жыл бұрын
You prolly dont give a shit but does someone know a way to log back into an Instagram account? I stupidly lost the account password. I appreciate any tips you can give me.
@sethnoah6451
2 жыл бұрын
@Jonas Johnathan Instablaster :)
@jonasjohnathan6074
2 жыл бұрын
@Seth Noah I really appreciate your reply. I got to the site through google and im waiting for the hacking stuff atm. I see it takes a while so I will reply here later with my results.
@jonasjohnathan6074
2 жыл бұрын
@Seth Noah it did the trick and I now got access to my account again. I'm so happy! Thank you so much, you really help me out :D
@sethnoah6451
2 жыл бұрын
@Jonas Johnathan no problem xD
you give the best presentation about anything
Soooo glad I ran across this. The video explained some things I just never gave much thought to. GREAT, Very useful information. The little FedEx guy on the shelf was a bit distracting though.
Wow Karen that was a great video loads of work for u as a presenter in that one. Packed with info and really well presented its nice to see u taking a bigger role hope it continues! Well done.
@maker_karen1785
5 жыл бұрын
Thanks! It's great to see people appreciate all the effort I put in. I love spreading knowledge and want to get more people excited about making!
Great video Karen! Thanks!
Excellent Video Karen...
Karen, great video and as always, I love your shirt. 😜 In all seriousness I look forward to your videos. You do an excellant job of explaining things.
Memory effect in resistors, motor coils, capacitors, and other components. The trick to remove the memory effect is, to overload the device then it becomes industrial, so you can use it for high performance use. Motors have to be offloaded, then the collectors have to be cleaned, the memory effect is in the brushed surface. By starting it 20x, it will spin up, and can be used as an industrial device. Solar panels are also memory effected when bought, and needs a full season to make it become industrial.
wow you explain so well !
Miss Karen, thank you, As this gesture of sharing well gained knowledge is equally as a well shared gesture, Godspeed
Karen, i love you stiker of the ben heck show on your laptop. keep on the good work. thumb up.
I love your videos they are great my aunt used to work at Hewlett-Packard I used to get bags of resistors transistors capacitors lot of them gold plated boy if save them back then they would have been worth some money I had a lot of fun building circuits of fun building circuits
Fantastic comprehensive reference & overview of resistors Karen, Don't forget the hashtags now on YT #resist #resisters #resistors =)
Ah, this looks like excellent series
Really Great video,
I have a question I know a resistors in series can be a voltage divider but, what's the application of a resistors in parallel. Thanks
Thanks, Karen!
Great video. I now understand that resistance is not useless.
I really like this video! You have corrected some my bad terms for a couple of parts. I should sound smarter now. :-)
Amazing Chanel to learn electronics thanks. Thanks
Thank you so much. You are a great teacher. I watch all your videos ☺️.
@element14presents
Жыл бұрын
Thank you! 😃 You should check out the new series: DC to Daylight!
I wish we had that type of teaching videos available back in the seventies.
@RaeesUnboxingwala
4 жыл бұрын
Alex Abadi I agree, we the new generation are very much blessed with the internet
Lovely video
Hi Karen, good to see you and Felix are still going to be on here.
@maker_karen1785
5 жыл бұрын
Hi! Thanks! It's good to still be here. :D
@Raletia
5 жыл бұрын
YAY! I used to watch Ben Heck but then KZread stopped sending me videos and I kinda forgot >.< This was in my feed! Glad to see you're still doing awesome work!
Great video. I NEED to learn more of the basics. I would love to see you guys use a 555 timer to make a "rapid fire" button for a controller, or possibly a strobe light.
@MAYERMAKES
5 жыл бұрын
Brad Young hmmmm... that could make a video...
@bradyoung6663
5 жыл бұрын
I've made one for a wired 360 controller, But I'd like to know how the parts work. How to adjust speed , etc. I just copied what I saw in a video that had no other info. I know you shouldn't use them online, but I rarely if ever play online. The button is great fun on COD or Left for Dead 2, etc. Have a good one Dude.
@maker_karen1785
5 жыл бұрын
I've got 555 timers on the list of subjects to cover in the future. Happy to take suggestions for the corresponding project video!
Thank you teacher
I wonder if you may have a voltage regulator circuit suitable for a motorcycle voltage of 20v ac to regulate at around 13.5 v to charge a battery and regulate current to supply ancillary equipment lights etc
What kind of variable resistor control with code using gpio pins?
Where can I find posters like the one in the background and others with helpful reminders that I can put up in a shop?
@maker_karen1785
5 жыл бұрын
Vishay. www.vishay.com/search?query=poster&searchChoice=part
Safe to say a lot of us are in love with you, Karen. Good luck with all the changes n stuff. Cheers.
@harrystechprojects3948
5 жыл бұрын
yeah im sure alot of are in love with karen
Lovly youuuuuuu I like your approach
Well explained! need to sort my Box-O-Resistance....some day...not today
@AirborneSurfer
5 жыл бұрын
Would that be a Borg Cube? (But that would make the resistance futile, I guess.)
Coudnt resist the vedio.....thanks Karen....
Nice video
Spectacular
I like your learning.
It's hard to resist an great explanation by a talented lady :)
Can you please make a video about smd inductors and how to read the value? I want to replace some inductor on my laptop board..I can't find anything on internet...R68322RQH this is the inductor
You forgot to mention potentiometers come in linear and tapered, and you can parallel up low wattage resistors for higher current handling
Thank karen v useful
Thanks!👍
How to count velue of two resistance in parallel connection.please describe it. From Dillip Kumar India
Very useful video. Have you moved shops now Ben has left, I assume that Ben owned the original shop in your recent videos.
@maker_karen1785
5 жыл бұрын
Still in the same shop, I have just turned the "break room" into my office/workspace. Because window and because sound isolation.
Thanks👍
Where Can i learn to repair electronics?
Dear lady your knowledge is impeccable but for us trying to learn Please slow down a bit
8:22 isn't the one on the right a variable inductor?
Aww.. thanks Karen. I always thought rheostat was just an obsolete word for potentiometer.
@pauljanssen2624
4 жыл бұрын
We used to just call them pots
I love it when you talk science to me... No really, I’m much smarter after watching this! :)
*matching resistors is like matching eyes with sweater*
Looking forward to a transistor video or two. I assume capacitors and coils will come before that.
Karen should have been the new host!
I’d have to say capacitors are more fun to watch explode than a resistor is burning up 🤓😜
"...because it has the words 'DON'T PANIC' in large, friendly letters on the cover."
1:47 *NO!!! NOT more efficiency!!* Carbon composition resistors were replaced because they had poor tolerances, due to the value drifting due to moisture and temperature, as well as higher noise. Carbon film and metal film resistors are superior because they eliminate these problems. Metal films also have the better temperature coefficients (which can be precisely controlled with the metal alloy used) Other than that, good video. :)
Superconductors don't have resistance, but as of now, it's unlikely you'll just come across one. :)
Suggestion for Demonstration of WHY Wattage Rating of Resistors matter: Take a 0.25 Watt 1 Ohm Carbon Resistor and a 8 Volt Battery. Do the Calculations to get that RV**2 = 1*9*9 = 81 Watts > 0.25 Watts, i.e. 0 Volts will fry that Resister with some Overkill. Proceed with this experiment with the usual "Do Not Try This At Home" Warning. Hook it up and Go Snap, Crackle, Pop!
The cutest ever...
😍 Isn't she wonderful💝
I wish they didn't change the color of resistor bodies to Blue it makes them so hard to read
🤔
Thanks for the info, the comments are creepy...
I cannot resist her. I'm over heating!
@nixonhoover2
3 жыл бұрын
rob peters you jerk of while watching?
karen is neat
Karen are you from united state?? Or Europe!!!
@maker_karen1785
5 жыл бұрын
I grew up in Michigan in the United States and now live in a different state, Wisconsin.
@AirborneSurfer
5 жыл бұрын
"South Canada" 😉
Where the heck is Ben Heck?
@Davedarko
5 жыл бұрын
Brian H welcome to the channel, are you new here?
So the dimmer is a giant resistant ....
@raccoon874
2 жыл бұрын
that it is - as is a volume control
Hey! You're not Ben Heck!
@maker_karen1785
5 жыл бұрын
Nope. I'm Karen. Hello!
@AirborneSurfer
5 жыл бұрын
I'll vouch.
I can't resistor O:-)
i love you .
Resistor!? I barely touched her! And don't call me Shirley.
Informative video ... and great rack
Got here from janku
nice i love you will you marry me pls
Because you dont speak in spanish. 500.000.000, people speaker
MILKY MILKY WARM AND TASTY
Nice bewbi