Resistors in Series and Parallel

Рет қаралды 70,317

Күн бұрын

This video describes how to combine resistors in series and parallel and calculate the equivalent resistance. This is useful when you need a resistor with a certain value but can't find that value available for purchase, or you want to use the resistors you already have laying around.
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Пікірлер: 56

@rakanmohamed8733 Жыл бұрын

This video just made me believe I will pass my physics test tomorrow. Thanks! It was very easy to understand and it was a fun video to watch

@thanktheknife 2 жыл бұрын

very well explained and easy to follow. Gratitude to you my dude!

@Good-Enuff-Garage 2 жыл бұрын

I've been looking for a proper resistor explanation for some time, and I am so glad I found yours, extremely well done, thank you

@BenFinio 2 жыл бұрын

Thanks! Glad you found it helpful.

@daz41262010 Жыл бұрын

this series is so cool to keep on book mark to view again and again :)

@BurgerBeatz 2 жыл бұрын

Great explanation, to the point and easy to follow.

@neharawat08 2 жыл бұрын

Thank you for this video! Simple and easy to learn! Thanks a ton!

@Sarge7711 9 ай бұрын

You are the freaking best, Straight to the point I love it THANK YOU!!!!!

@shsftech3792 3 жыл бұрын

Thank vety helpful video and easy to understand!

@markholden3216 9 ай бұрын

Thank you so much! This was clear and made sense of a topic I am only beginning to study. Thank you too for the fritzing link.

@pufango4059 2 жыл бұрын

Easy when you know ! Excellent video A+++++

@pauldavis7703 3 ай бұрын

Perfect. Thank you!

@clairejones314 2 жыл бұрын

SUPER HELPFUL!!

@eaoke3383 Жыл бұрын

What a lad- thank you for your help

@AMPROEngineering 2 жыл бұрын

Thank you for your videos. They are very helpful but I was curious if wattage says the same. If you have 2 1/4 watt resistors in parallel, are the now a single 1/2 watt resistor or does that have no bearing on it?

@BenFinio 2 жыл бұрын

You need to calculate the power for each resistor individually to make sure none of them exceed their individual power rating.

@seeharvester 8 ай бұрын

Thanks Doc!

@zacharyriggs8681 Жыл бұрын

Awesome. Anyone know of any videos that explains these equations better?

@RC-Heli835 2 жыл бұрын

Thanks for sharing Ben! This helped me to solve the answer to this question.......... If Joe used 40 2k ohm 5 watt resistors to build a 50 ohm 3000 watt RF dummy load submersed in oil in what configuration did he install the resistors? You have to wind up with 50 ohms, that's the key.

@edwardhugus2772 Жыл бұрын

Thanks! All thumbs up!

@InverCollegeTech 5 ай бұрын

I find the best way to explain resistors in parallel vs series is to use the anology of turnstiles at a football stadium. 1 turnstile = 1 resistor e.g. 10,000Ω. So if you had two turnstiles, one after another (in series) it would be 20,000Ω which slows the crowd entering the stadium even more. However, if you've two turnstiles in parallel, it allows the crowd into the stadium quicker, so half the resistance. Then I explain resistors of different values in parralel, which is when you've got two turnstiles, one that can quickly scan tickets from a QR code on your phone (low resistance), while the other is old man with bad eyesight that has to read the ticket and mark it off a list of the tickets sold (high resistance) i.e. resistors of different values.

@JM.MEL_ Жыл бұрын

Thank you!

@torukojinnn6331 3 жыл бұрын

Great video dude

@BenFinio 3 жыл бұрын

Thanks!

@soupinnile4268 2 жыл бұрын

Very helpfull.

@CerebralDad 4 жыл бұрын

Hey Ben! Do you know how to mathematically predict how a pull down resistor will affect a 5v pwm signal. I have a controller board that has a floating pwm pin where I needed to add a pull down. I chose 1k ohm- because “the internet”, however I don’t think I’m getting 100% signal any longer. How do I find the minimal resistor value to pull down the output without affecting the value. It’s a poor Chinese board design where having a floating pwm pin is a safety issue and when powered on defaults to 100%. This is for a laser.

@BenFinio 4 жыл бұрын

Hi Keith! You would have to try and look up the specs of the board and see what the "output impedance" or "internal resistance" of the pin is. A mathematically ideal pin has zero impedance when used as an output (i.e. voltage does not drop at all when it's loaded) and infinite input impedance (does not draw any current from whatever it's measuring). In reality, the pin has some finite impedance in both cases. So when used as an output, and you add a pull-down resistor, you actually have two resistors in series forming a voltage divider, which will drop your output voltage. If you can find the internal resistance of your pin, then in theory you can calculate that voltage from this equation (where R1 is the internal resistance, R2 is your pull-down resistor, Vin is the ideal voltage from the board, e.g. 5V, and Vout is the actual output voltage): en.wikipedia.org/wiki/Voltage_divider#Resistive_divider (note that technically, this is assuming that whatever else you have your PWM pin connected to is not drawing any current, and all the current flows through R2). So, depending on what your minimum acceptable voltage is, you could calculate the minimum resistor value you need. However, that's all a very long-winded way of saying "just try a bigger pull-down resistor." I think 10k is a pretty common value. I don't think it *hurts* to oversize the resistor.

@reedy8585 Жыл бұрын

how is the power handling distributed across resistors in series , natturally you would expect 2 2w resistors in parallel to be capable of handling 4w however does this also apply in series or is the first resistor in line exposed to the full load and still only capable of 2w ?

@BenFinio Жыл бұрын

Hi - this is kind of a lot to answer in a single comment, you might want to check out my intro to circuits playlist: kzfaq.info/sun/PLKL6KBeCnI3U6KNZEiitdtqvrxkBhpuOp.

@sanjogkumarbarik7460 9 ай бұрын

sir,what about watt...?? watts increase or decrease in series and parallel ckt ?

@panzznine713 3 жыл бұрын

i've been wondering, is there a significant effect on using a multiple resistor than using 1 resistor, for example i have 1 10k ohms resistor and also have 2 5k ohms resistor, but i only need 10k ohms for my simple circuitry. so does using more resistor than using 1 resistor have an effect on the circuit?

@BenFinio 3 жыл бұрын

It depends on the circuit, but in general for most beginner/hobby circuits it probably won't matter. Two resistors take up more physical space than one resistor, so it could matter if you were designing a printed circuit board (PCB). However, assuming the resistors all have the same power rating (1/4 watt is the most common), then the two resistors would be able to dissipate 1/2 watt total. So if for some reason you need to pass a lot of current through the resistor but don't have a 10K resistor rated at 1/2W, then you could use the two 5K resistors.

@panzznine713 3 жыл бұрын

@@BenFinio i see, ty ty that was bugging me from the start lol

@xavierlozano9459 3 жыл бұрын

I have a 100 wattsiren (8 ohms) with amp (11 ohms)... Im trying to lower the volume of the siren by adding resistors. I tried 4 900 ohm resistors in series parallel but the volume dropped to low. I'm afraid to damage the amp, any suggestions? Will it be better to use a 100 watt attenuator?

@BenFinio 2 жыл бұрын

Hi - it's common to use current-limiting resistors with LEDs (kzfaq.info/get/bejne/e8tzm5lpxperdZs.html) but they are not typically used in this manner with other types of loads. For example with a motor you would either decrease the voltage or use pulse-width modulation (PWM) to decrease the speed, not put it in series with a resistor. I'm not that familiar with sirens so I'm not sure of the best way to control the volume.

@CrusaderGeneral Жыл бұрын

Im trying to figure out how adding a resister in parallel to a motorcycle blinker slows down the blinking frequency. I understand the parallel limits the current and serial limits the voltage, but not sure how that changes the rate.

@BenFinio Жыл бұрын

That's more complicated than what's going on in this video with just resistors, as it depends on the rest of the circuit connected to the blinker.

@Unplugged_Reality 3 жыл бұрын

Keep it up :D

@Efrancoskun Жыл бұрын

thanks mate

@jimcatanzaro7808 2 жыл бұрын

Combination of resistors in a audio circuit could be bad a resistors value drift especially in tube amplifier designs only in a power supply would work

@Delta_li_gifs Жыл бұрын

Thanks

@sampam263 Жыл бұрын

very easy rules to use, I may have an even more simple formula for resistors: (R1 x R2) / (R1 +R2)

@dharmakissoon Жыл бұрын

Hi how do I put resistors in aluminum case

@enriqueemilio8990 3 ай бұрын

What about the watt resistance?

@kenya_3364 2 жыл бұрын

I don't get the parallel equation :( Can someone tell me how to do the equation

@CerebralDad 4 жыл бұрын

This is Keith Brown

@jhoanstickmosqueravargas9998 Жыл бұрын

Entonces quien gano?

@feteheademe8746 3 жыл бұрын

where have you been, now I know my electronics instructor suck's

@dogbarbill Жыл бұрын

3:55 I hate to be a dummy but, explain the math for the 100 and the 47 in parallel to get 31.97

@BenFinio Жыл бұрын

1/(1/100+1/47)=31.97

@steve-paul 11 ай бұрын

1÷(1÷100+1÷47)=31.97

@0GHatMak3r 5 ай бұрын

Example ps: there is no subscript q so I'll be using "ₚ" R2 = R1 Series Rₑₚ ≍ r1 x 2 Parallel Rₑₚ ≍ r1 ÷ 2

@ebrahimkarimi1504 3 жыл бұрын

Easy

@jimcatanzaro7808 2 жыл бұрын

Funny I just got a bunch of 100ohms R today

@bobbyd1961 Жыл бұрын

unfortunately Fritzing is NOT free they are asking for $10 to download it but thanks anyway

@BenFinio 11 ай бұрын

Hm - is the "donation" mandatory, or can you just close that and download anyway? It's been a while since I downloaded it but it was free at the time. Tinkercad is a good alternative that runs in a browser and is free (for now at least).