The video is well done and the content is explained at a level easy enough for anyone to understand, but advanced enough to help you in the subject. He starts the subject at a level assuming a extremely elementary knowledge and slowly works up the ladder of knowledge. If you are wondering if this is the video to watch to help you understand the Piezoelectric effect, rest assured that you have found the right video.
Thank you sir. I've always had an insatiable appetite for scientific knowledge and RU-vid & science kits I buy from Amazon are definitely my go to places for acquiring just that.
Great Video, Thank you, But here is something, I didn't get. Why quarts polarized in minus and plus, in first level, when you pushed on it, up side was one oxygen and down side was two silicon, why top in becomes more positive ? and in other case, why bottom in becomes more negative ?
@@189vansHey mate, its because imbalances and because it is not in simetry, top side is very last edge of the point with silicone and bottom side is very last edge of oxygen, so it takes potential different from the surface, lets say like that, and when i levels, it takes the charge that is the most.
So if electrical current is generated in crystalline rock in our crust - as a capacitance effect to our electrically varying ionosphere - we have a means for huge pressures to arise from distortion and further electric currents in the Earth?
Thank you Sir. In terms of collecting or harvesting this energy production to charge any rechargeable portable devices, do we need to convert it from AC to DC? There are many energy harvester module sold in the market today but I don't how they are being used or applied
SBS' (The broadcaster) subs always appear in yellow fill, black stroke. A practice that pre-dates Premier text presets and possibly the invention of non-linear digital editing software.
Hello! Very helpful video. I have a coupe of questions about the argument. Is this phenomenon manifested in a certain scale in every ceramic composition? If it's not, which are the main parameters that make a ceramic composition (crystal) a piezoelectric one?
No it does not manifest in all crystals. In fact, crystals can not have centric symmetry. There are a range of crystals that do show the effect. The effect predominantly is determined by the charge density upon pressure applied and the relative elasticity of the bonds between the atoms
I an not an expert on the piezoelectric (aka I am not an electrical engineer) but a current should remain as long as there is a potential difference. SO in theory, if you apply pressure to it, a PD should remain and so a current could be maintained. I am happy to be corrected
Perhaps thinking of the object like a shape that does not want to change (stiff/no flex) but still conductive. if you connect the compressed side with the uncompressed side, the fact that the material is conductive makes it so that a circuit is formed and the electron density tries to balance out. I'm only just discovering this stuff but that makes sense to me. If there is no movement and the electrons are already balanced out again (ignoring resistance of circuit) then there can be no current because all materials in the circuit are balanced actually, even if you are still deforming the objects shape. Potential energy is still held in the crystal though because of its stiffness(elasticity?).
what would happen if I would keep a crystal of quartz under a constant mechanical load along the force axis? Would the voltage vanish after a milisecond moment or would it remain??
+anubhab kundu in theory a potential difference would remain but it would be DC only. Although not an transducer expert, a DC output would be problematic in trying to amplify the signal.
High School Physics Explained thank you for replacing electrochemical batteries!!.....I think now all vehicles can be driven by DC piezoelectricity which never requires a juice-up.
+anubhab kundu I don't think a current will flow just because there is a potential difference. Besides, no more energy input via pushing would mean no energy output due to LCE
@@PhysicsHigh The Piezoelectric effect was first used in radio before the vacuum tube; not medical equipment. That's where you should have started. That's all.
are you kidding me? youtube has saved me thousands of dollars avoiding costly mistakes fixing things on my vehicle and other tips. You Tbe videos have taught me far more useful stuff then anything in my school years that most things have turned out to be lies
This is the first compelling science video I was able to understand in a while. So it's not just the organised structure that gives it the piezoelectric effect, it's also the arangement of the charged particles. I've heard that bone is a good piezoelectric material. I'm guessing that's how bone conduction works, as the sound distorts the structure of bone, converting it to electrical signals, then it reaches the 8th cranial nerve which get's processed by the brain as sound. I'm a bit foggy about the mechanics of sound hearing though. The ear seems like a very complicated piece of machinery.
Hello Paul! My name is Rodrigo Ruz and I am a young scientist from México. Do you think that using PVDF crystal would be a feasible option to produce energy with sound?
Well I guess it would, as when lightning strikes it actually breaks some bonds in the air causing nitrogen from air to form a new bond with water forming nitric acid.
If you had a battery to store ac produced by this effect, then used it as a supply for the same same crystals, what would be your energy lost? Or would it generate more than it lost?
Excellent video, thank you very much!! The explanation in 4:20 has opened my mind... One question here please: I did not understand the reason in putting the negative charges in the upper or lower part of the crystal, and viceversa for the + charges, in the 9:37 minute... Thank you!
Silicon dioxide is slightly polar, that is, the molecule is slightly more positive on one side and negative on the other. Water has similar characteristics. In a normal lattice arrangement, there is no net polarity. However , when distorted then there is a minute polarity on surfaces depending on the stress placed on the crystal.
Question: When you squeeze the lattice laterally (4:57), do the four "middle" Si+ and O- cancel out their energies so they don't influence the current?
Actually we can compress one quartz vertical and the other on the horizontal then a dc battery results and we could use it to power device and if we use it to be compress one under total stable with no molecules oscillator and compare to a normal crystal then we get natural crystals frequency of atomic frequency like French measure atomic clock
I subscribed:) and best explanation about converting sound to emf ,soo now I'm trying to find a way to transfer energy from one place (sound waves) to ring candies in the box (emf) to get energy produced on long distance? :)
wait a minute, glass is silicon dioxide, same as quartz but is from melted sand. why doesnt glass generate a an alternating field or behave like a quartz crystal?
Please, I did this practical experiment. My AC voltage was varying , sometimes, 10V sometimes 2 V. That's not my problem, the problem I'm facing is, the rectifier circuit absorbs all my ac voltage and delivers value of around 0.5V as the DC output, please, what should I do?
I'm sorry I'm taking the liberty to intrude for something that's not directly related, this is the only way though to find something that can't find as easily as I thought one could : Are piezoelectric materials 'energized' by way of hydrostatic pressure (changes) of any liquid, off course, but mainly water. Thank you.
The arrows representing the current (electron) flows within the distorted quartz (at 5:13 and 5:50), aren't they pointing in the wrong direction based on the description of the electric field created by compression? The electrons flow would be from the (electron higher density) o- to the (electron lower density) si+. Alternating the compression direction would still generate ac current, just the arrows on both compressions should be reversed.
This is a lot like how magnetic and electric forces are generated, only the actual molecules move physically. I wonder if there is any magnetic component to the molecular charge as well? A question for future explorers of the very small.
I understand the piezoelectric and the inverse piezoelectric effect, but how is a transducer able to do both simultaneously? Like in an ultrasound scan.
unit of piezoelectricity are carge per kilogram per degree celsius per kgf per second square since instantaneous acceleration of forces giving rise the stress of the material which squeezing the electron or give it rectifying?
hi sir i hope u r video was very useful to everyone to learn the concept but if u don't mind would like to explain me the ultrasonics chapter in detailed with an useful video
I really want to test how much mechanical energy gets converted in electrical energy, but I dont know if that's possible. It is for a school assignment and I am stuck with this question for a very long time. Can you please help me?
+Arjan Klinkenberg so to test you mean set up an experiment with piezo electric crystals? If so, one thought is to get a microphone that is piezo based. If you can measure the sound and determine the energy then you can also measure the voltage generated in the microphone. Both measurements should be related.
High School Physics Explained thanks for your reply!! :), but i may take some time again... i have this kind of piëzo electric elements: m.reichelt.de/Signalakustik/EPZ-20MS64W/3/index.html?ACTION=3&LA=2&ARTICLE=145915&GROUPID=6560&artnr=EPZ-20MS64W&SEARCH=%252A my potential experiment was to connect my piezo to an osciloscope and messure the voltage and current with that. To create a current i would push the piezo element. ofcourse i will do a more acruate experiment in which i know excactly how much mechanical energy i have. But before I was going to start i need to know if this could work. I would really appreciate if you answered this question too. (p.s. is it possible to calculate the electric energy with E=V*I*t)
It could theoretically work. Yes, you would calculate the E = V.I.t equation. My question is how would would measure the mechanical energy? And how would you measure time? Maybe drop a small mass on to the crystal (not enough to break it of course) you can then determine various variables from force, momentum, work analysis. Has its problems though. Paul PS - I suspect you are dutch by your name :)
High School Physics Explained yes i am dutch hahah. i may calculate the mechanical energy by dropping a rubber ball on the piezo element. i could calculate the mechanical energy with this equation: E=m*g*h. I will not include the energy loss throught air resistance because that would take too much time. i can meassure the time with the osciloscope, or not?
Umm, a slight correction there. A transducer is actually a device that converts some form of energy to another and in this scenario, the transducer converts electrical energy to sound energy and vice versa.
It never occurred to me that the word "ultrasound" involved actual sound. So if an ultrasound uses sound to paint an image is that like echolocation? Do bats see images similar to an ultrasound baby image? Also i have been collecting crystals and minerals, and trying to understand this whole "vibration" thing people are talking about i always assumed that was some kind of spiritual thing, i'm trying to learn if there is any scientific basis for it and it seems there actually is! I'm wondering with crystals like quartz or tourmaline how much pressure needs to be applied to create electricity? and can that electricity be noticeable to humans, for example if i squeeze tourmaline will i feel something like static electricity? Or does the crystal need to be compressed much harder by machine? Sorry i'm asking so many questions i just never learned this at school and its really fascinating. So if i got this right, applying sound to crystal creates electricity and applying electricity to crystals produces sound? Awesome :)
+NymphetaminexXxGrrrl yes but not to any crystal. It needs to become polar under pressure. So for example crystals like salt won't work. Tourmaline is piezoelectric. The effect is usually when you deform the crystal by about 0.1%.
The earth's magma is very rich in silica. If silicone dioxide is affected by sound waves and electricity causing its lattice structure to vibrate, will a failed star, white star emitting massive electromagnetic wave towards the earth cause the magma chambers under the volcano to become heated up and more viscous thereby inducing an eruption?
guess it depends on the exact amounts of matter and energy you're dealing with. Seems like it would be tough to tell how much energy is gonna get through the atmosphere then through the crust to affect the magma. I'm not very interested in the answer, but maybe you could isolate your variables, look up the appropriate equations, and grind it out? (I'm curious about just how much energy you need to significantly heat up that much molten rock...seems like a lot).
