What is a voltage divider?
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- เผยแพร่เมื่อ 11 ก.ย. 2024
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you are Great in terms of using Normal language. and all of your other work respect. :)
+Yakuza Ali Thank you
One of the best explanation on what a VD is and what it does. Thanks Louis.
Still watching these in 2021, keep up the great work Louis!
Thank you Louis, this video are unique, no one in youtue explaine this VD like you. This series are my favorite keep them coming
Thank you!
Keep them coming Louis. This video series is great.
One suggestion. Would you consider a mouse pointer halo so that your hand movements in schematics could be more easily tracked?
liyor23 Link me to one that would be good and I'll give it a shot. It's been mentioned several times but usually when I go to look for one something else runs along that takes away my time.
Louis Rossmann I have used this one recently, it's simple and easy.
www.math.uaa.alaska.edu/~afkjm/PenAttention/download.html
truly great explanation! omg, i have been trying to learn electronics for awhile and you came, do one talk and i am like AHA, wondrous man!
You are the best teacher out there ❤
First of all, I think your tutorials are the most helpful and to the point. Not to mention they are so easy to understand! Nice work bro! :-).
Thanks for your time and dedication you spent on these guides. When you mentioned in one of your video stating you are not a good teacher. I think you are a good teacher to many, if not, at least to me. Keep it going, your work is greatly appreciated.
Minh la
9:51 ahhh, when Google used to be free from bloated advertising, and paid content and other distracting bullshit. You could actually confidently click I'm feeling lucky. Now I'm feeling like I'm living in a dystopian tragedy.
Appreciate the videos man... It's a lot easier for me to learn this shit from someone that thinks like me
Watch a couple videos on this, 2 out of 12 were helpful. This was one of them.
thank's luis on simplification
Such an amazing video!!!
2 people hate learning
2 people are going to google the things and act like total douchebags arguing with scientific terms. No worries. We are used to those putos.
Thanks for this clear explaination 👌
a voltage divider (also known as a potential divider) is a passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). Voltage division is the result of distributing the input voltage among the components of the divider. A simple example of a voltage divider is two resistors connected in series, with the input voltage applied across the resistor pair and the output voltage emerging from the connection between them.
Resistor voltage dividers are commonly used to create reference voltages, or to reduce the magnitude of a voltage so it can be measured, and may also be used as signal attenuators at low frequencies. For direct current and relatively low frequencies, a voltage divider may be sufficiently accurate if made only of resistors; where frequency response over a wide range is required (such as in an oscilloscope probe), a voltage divider may have capacitive elements added to compensate load capacitance. In electric power transmission, a capacitive voltage divider is used for measurement of high voltage.
this is how to exploit the teory of voltage devider on reality, thank you this is was really helpfull :)
If you only want to lower the voltage from 12 to 3, why don't you just use one single resistor? What is the purpose of using a ground path with an extra resistor? : / I probably need to know the things you taught in the older videos, let me start learning then
If there is no resistance (or impedance, which is like resistance in AC circuit) the current will just use that path without doing useful work.
If you have a river and you cover only half of it with a mill, more water will flow through unobstructed part of it than the part with mill.
Keep in mind that resistors in series divide voltage while having same current, while resistors in parallel divide current while having same voltage.
In this case the output can be thought of as resistor and it is in parallel connection.
Just a QQ in one of your other vids I thought I remembered you saying that a resistor will not change the voltage but resist the current so on one side of the resisitor you have say 12v 3a and on the other side you still have 12v but maybe only 1.5a. so how is it different in a voltage divider? why is the voltage changing when it doesn't change in other scenarios. is it due to having ground so close?
because you are connecting the resistor to ground.
the first resistor limits the amount of current available. so there is not a lot of power available.
the second resistor, usually a lower resistance than the first resistor, sends that very limited power to ground, which winds up lowering the voltage.
Hey just to clarify, I know this is and old question but it might help someone else.
The voltage divider works when resistors are in series (Current divider works when resistors are in parallel).
When resistors are in series Voltage does actually drop across a resistor but current doesn't.
Electrons flow because of a force that force is the voltage (energy per charge). When the electrons hit the resistor it loses energy because the electrons collide with the resistor so it has less force. Current on the other hand is just the speed of the electrons passing though the resistor. Now to get your head around current you need to imagine current going around a closed loop circuit at the exact same speed, like how a bicycle chain goes around at the same speed. When you apply the brakes on a bike the chain will still turn at the same speed just slowed down. That's how resistors work in a circuit, its like applying a break. It doesn't matter where you put resistors, if resistors are there it's going to slow all the electrons the same.
Now back to the voltage divider, if you measured from the top you will get 12v, in the middle of resistors 3.3v and at the end 0v. The current will be at the top 39uA, in the middle just before the black dot will still be 39uA. When it hits the black dot it splits 33uA will go to ground and 6uA goes to the chip. When it splits that part of the circuit becomes a parallel circuit. So that's why instead of voltage now dropping the current drops. The reason why more current flows to ground than to the chip is that the resistor is 100k but the resistance of the chip is 500k. And like Louis said the electrons will find the easiest path to ground and they all rush to the ground point.
Also extra clarification, If there was no middle line going to the chip the scenario would be:
voltage drops will be the same 12v , 3.3v , 0v but the current from the top to bottom would stay the same (no parallel circuit).
@@rossmanngroup ....correct me if I am wrong, but resistors are voltage controlling, not current controlling. re: Kirchoff's current law: current remains constant throughout the entire circuit. Yes? No?
At 5:03 u said Z is a resistor which all wrong... Z stands for impedance (which is a type of resistance offered by an inductor or a capacitor)
it is correct because it is referring to a voltage divider possibly using capacitors and inductors which with reference to an AC source would be an impedance voltage divider.
can you put power through a voltage divider using a transistor to make it more efficient so it is not always on? Or make a parallel connection from the voltage (whenever voltage is switched on in the system) to the desired read pin? Anyone please correct me I am new at this stuff
😳 😳 wow...
Vout= R2/R1+R2*Vin
sorry, but this one wasn't clear (please do it again!). I would have love to see at least the basic circuit (a simple drawing would have been enough), and also what the logic behind, why does it works that way?