Voltage Divider Circuit Explained!
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- Опубліковано 28 сер 2024
- This physics video tutorial provides a basic introduction into voltage divider circuits. It provides a simple formula to calculate the voltage across a resistor in a series circuit with two resistors in series with a battery. it contains plenty of examples and practice problems. It discusses the effect on the output voltage of a voltage divider circuit when a load resistor is placed in parallel with R2. It discusses how to design a voltage divider circuit to meet certain requirements.
Schematic Diagrams & Symbols:
• Schematic Diagrams & S...
Resistors In Series:
• Resistors In Series - ...
Resistors In Parallel:
• Resistors In Parallel ...
Series and Parallel Circuits - Light Bulb Brightness:
• Series and Parallel Ci...
Equivalent Resistance of Complex Circuits:
• Equivalent Resistance ...
How To Solve DC Circuits:
• How To Solve Any Resis...
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Current Dividers:
• Current Dividers Expla...
Parallel Circuit Challenge Problem:
• Finding The Current In...
Kirchhoff's Current Law:
• Kirchhoff's Current La...
Kirchhoff's Voltage Law:
• Kirchhoff's Voltage La...
DC Circuits Review:
• Series and Parallel Ci...
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KCL and KVL Circuit Analysis:
• Kirchhoff's Law, Junct...
Thevenin's Theorem - Circuit Analysis:
• Thevenin's Theorem - C...
Norton's Theorem - Circuit Analysis:
• Norton's Theorem and T...
Superposition Theorem:
• Superposition Theorem
Maximum Power Transfer:
• Maximum Power Transfer...
Physics PDF Worksheets:
www.video-tuto...
Final Exams and Video Playlists: www.video-tutor.net/
Dude this guy teaches everything I am so astounded. I remember trying to get help for chemistry, then some for calculus, and he is even here in an electrical system and circuit lesson. What can't this guy do?
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How is it possible you've literally been teaching me everything???
Wow! Before watching this video I watched and read many other tutorials on voltage dividers, but still was confused and had many question. Now I finally understand. Thanks.
Though you didn't mention practical examples of voltage divider usage
I've been watching these videos for years I really appreciate the great work you do!
Am I glad I found this video. I find it refreshing for it to bring me back to the basics. Thank you JG!
from confused to confident, I am grateful for your help!
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please also add something about Thevenin theorem
Am getting it together here,,God bless u sir
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This video series is awesome! Very specific and helpful problems for real world examples. Thank you for sharing.
Really is it awesome? What resistors did he use in his first example? He just puts 10 and 20 are that doesn't tell anybody anything
Bro u are a lifesaver thanks a lot man. Have a nice day
Why is his voice so *SOOTHING* ?! 😍
YOU MADE THIS LOOK SO EASY TYSMM!
For #5 how does he know that R2 should be approx 100times less to get 3V?
The bigger the internal resistance, the closer it is to the original output voltage. The internal resistance, as he stated, is recommended to be at least a hundred times more than R2.
Universal Narcissist what about if the internal resistance wasn’t as big?
@@Imkicelee it wouldn't be as close to 3V. If R2 was 5000ohms the total R would be: (1/5000+1/5000)^-1 + 15000 = 17500ohms, wich means the voltage out is: V in * (R2/R1+R2) = 12 * (2500/2500+15000) = 1.71 V and not even close to the 3V we wanted.
Thank you so much for this class i got it now keep the good work teacher
At 17:53, does he know that the voltage around R2 is 3V due to the fact that the device needs a voltage of 3V and voltage is the same across parallel branches?
aw jeez you explained it far better than my physics teacher
Lagi akong nanunuod ng mga posted video mo, salamat ( I've always watch your posted videos, thankyou) ☺
You all the tutorials so easy....even with the math in between..
Thank you
When I have 20vt, and know vo is 12v that tells you to get r1 is 8v (20v-12v) x .05a is 160 ohms. r2 = 12v /.05a =240.
You seemed to do more work to get the same answer.
Thanks for this
We really love you sir
You are awesome. Finally I understand. Please make a video of problems of strain gauge.
God of mathematics and science
Cant explain how helpful this channel is
You are an excellent teacher. Thanks.
In question 5....how did you get R2 as 50 ohms
Your a real one for this
Just a Word of thank you for your efforts to make this simple, I came across a voltage divider problem in lab and saw the efficiency was terrible with parallel device to R2 , this video made my day thank you from all my heart.
On the 5th problem how did you know that R2 should be 100x less than the device resistor?
did you ever get an answer?
For the question at 4:23, it should be written as.
A voltage divider circuit, where R2 has an output of 12V, and the circuit has a current of 50mA, using a 20V battery. Find the resistance of R1, and R2.
You are required to design the circuit..
how should calculate input voltage
For #5, I think the current that being delivered from the battery is not 60.2mA because in his calculation, he did not allow for the the current that being consumed by R1 = 150 ohm.
I know it’s been two years, but for anyone else wondering the same thing. No, he is correct. Current does not drop in a series circuit. So the current before resistor 1 is the same as current after resistor 1
Thanks tomorrow is my exam😎
thanks for including CURRENT!!! i blew my fuse on my multimetre so i couldnt find out what it was...
Good video. I feel that the wording in the outputs voltage and amperage is deceiving. You can get a fixed voltage using this method but the amperage through the output of our new source will depend on the resistance of the load. I think the wording would be better if you stated that the circuit without the load connected in the voltage divider would be (blank)mA
Hello sir . Sir i cant beleive this because you can solve or know about every topic .from every subjects how you can do this
bhai he is an all rounder
Thank you sir. You are just so good.
4:10 if u want to decrease the voltage why do the resistors have to be the same? thank you so much xx
thats to divide in half, they have to be the same to divide in half
The largest resistor in the voltage divider will drop More Voltage. That resistor can get very very hot! So watch your power rating of that resistor.
im on reading week and totally forgot i had an assignment and had a massive brain fart, i could kiss you! thanks bro!
found kind of a hacky way to find the resistances.
If you divide 12v/20v you get 0.6
and 0.6x400Ω is 240Ω, so you get r2 from that equation.
no clue how that worked out but somehow it did.
Thank u for the vedio, but i can't understand how we decide resistors for circuit with knowing Am .
You need to know more. For example: I build a circuit to turn on an appliance using an LDR (light dependent resistor). The specs said that it has a resistance between 5k and 500K (depending on amount of light). So I choose the minimum to work which is 5k. Next I looked at my relay. It said that it needs minimum 2V to turn on. So no I know that my Vout is 2V. I also know that my R1 the (LDR) is 5k. I also know my Vin because I used a 5V supply. With all this info I was able to build the circuit using this voltage divider here and I turned on the appliance with a flashlight over my LDR resistor. All I had to do was to find R2 to give me the 2V at Vout (which was the relay).
Another easier way is that the voltage in series adds up so you can subract the given voltage against the total voltage to find the missing voltage across 1 resistor
I don't know if I can get clarification on how the external resistance across R2 is 50 ohms while the internal resistance across it is 5000 ohms.
I'm here again. Thanks for sharing it with us daddy
7:40 for this question i solved it slightly different but got the same answer. i did 12/20 times 100 which equals 3/5. i know that R2 must be 3/5 of 400 and that leaves R1 to be 2/5.
😂this guy is literally saving my electrical engineering degree
at 11:43 , the voltage calculated to be 9.52, that's across the two parallel resistors right? So the voltage drop across R1 is 11.48 since 20-9.52=11.48 right?
Thank you so much! Sir your lectures help me alot
Amazing!! Thank you!
#5 is not clear
Please what app did u use in writing and drawing the circuits......it made explanations easier....let me know the name of the app please
Thank you so much.
If a ckt contains r1,r2,r3,r4,and ,r5 resistors then what resistor value we used as numanetor
Does that mean that if I want to limit the current I should add R2 again?
according to kvl, the voltage exiting the circuit should be 0 but at 4:08 you said that the voltage output is 6v. Should not 6v be between R1 and R2?
@10:51 Why is the numerator Req? If we're finding the voltage across the device, shouldn't the numerator be just 1000 Ohms (resistance of the device)? Similarly, if we were to find the voltage across R2, shouldn't the equation be vout = vin ( R2/R1+R2+R3 ) and not vout = vin (Req/Req + R1)?
Thanks
can you make a video explaining about delta wye conversion...ur explanation helps alot.No other channel can make me understand something as fast as yours
So where is the required voltage taken from? Across r2? Would you connect a component across it?
yes + across and - to negative
I hope I understand you correctly the voltage is what you select you choose a voltage and you choose the current then you figure out the resistor size
shouldnt number 4 be R2/90.9+R2? if we want to solve the voltage across R2 specifically?
you lost me @ 17:40 ... Does anyone know the logic behind this other than looking at other examples?
wow sir you are everywhere..
3 beers and a shot of whiskey, watching tube. You make more sense. Definitely better understanding for me , rather than by my highly qualified engineering mates in the pub. Ta.
Why didn't you use the 100 ohm from R1 when calculating Req, so that R1 @ 100 ohm will be in series with R2 + R Device to give 190.9 ohms? Was it Req of the entire circuit or just the part around R2 + R Device?
Thanks a lot, this video It has been very useful.
On the min: 9:01 Would it be possible to find the value of R2, in case Vin, Vout is unknown?
Here is an example of the same circuit, only adding an additional parallel to the resistor r1:
Vin = ?
Vout = ?
R1=100 || R2=2k
R3= ? || R4=1k
hi thank you for the information you din't show us how you calculated Resistor equivalent on qsn 4
0. Construct a dual potential divider circuit with a common voltage source as supply. The
potential drop should produce an output which is 5 times greater than the cut in voltage of a
PN junction diode.
Can u please tell us the solution
Legend!
Is Vin referring to the total Voltage? I'm not entirely sure about this but otherwise it wouldn't make sense. Assuming that Vin doesn't refer to Vtotal, then I assume its the voltage "coming in" from the first point we measure it, right before Req. But after assuming this, Vin shouldnt be equal to 20V which is Vtotal since R1 should cause a voltage drop before the starting point that we're measuring. Can someone explain? I feel like I understood part of it but didn't get the main point. **If** my assumption is right, then shouldnt we say Vtotal instead of Vin?
Really nice lessons.
Wait hold up, what I learn for, it just do it with series circuit would be more efficiency? Why don't they just put it as series circuit?
thanks you legend
Thanks!
Why was question four raised to the -1 power?
I have a transformerless LED driver from a China LED Bulb but it's voltage output is more than 300V DC. Can I reduce the V-out to 45V DC using this Voltage Divider Method? Will it be safe to used to turn on several SMD LED in series??
how can we maintain that voltage without changing the resistor value
good video
Usefull tips
Thank u
I can u dis in my modification circuit
4:33 but the output to the load on the divider is 50mA and not from the battery. I think that is the real practical problem
Are voltage divisor and current divisor concepts used in capacitors, batteries etc ? Just like in resistors
If multimeter shows Vin with respect to Vout to be a lesser value than expected what could be the reason?
2:11 BREAKING NEWS: THE LEGENDARY ORGANIC CHEMISTRY TUTOR HAS USED A CALCULATOR
Why did you divide r2 by a hundred in 18:02 ?
why did you place the internal resistor in parallel and not series @8:39? I mean what's the thought process behind it?
i think bcz it said across it
why is the current in milliamps instead of just amps at 21:30
Thankyou bro
Thank you for all your content!
love you sir...
Please how do you calculate for the input and outputt
So nice
What if we had more resistances could we still do (r1/(r1+r2+r3)) or we’d need to do it two at a time
can just add more
what is output voltage??
Yes nice video but how can i make the transfer function of this ?
The only accurate way to determine R2 is to use a load and adjust R2's voltage with a potentiometer to arrive at the correct voltage. The resistance on the other side of the potentiometer is R1. I have done this so I know.
I saw this after my exam 😄
At 06:00 Why u considered only 2 resistors to design vdr circuit..why not 3or4? and at 09:04 current must enter in to 100ohm coz..current always chooses low resistance path? If reply..very thankful...
1) VDR circuit only has 2 resistors. It is used to divide the output voltage in any desired ratio from the input voltage .
2) Higher resistance means lower current flow. Lower resistance means higher current flow. Current would still flow through both resistors. Just that there would be a high current flow through the 100ohm resistor.
@@samsungnote2683 thankyou