- In aprevious video clip we disputed what electric Charge is. Usually it's a building thatprotons and electrons possess due to the fact that of i beg your pardon they have the right to attract and repel other protons and also electrons. We speak to this "The electric Force." and also of course this particular day we have discovered so countless other particles that also possess this thing dubbed less charge. In this video, us look at what the symbol and the unit for electric charge is. Therefore the symbol because that theelectric charge is q. And we measure it in aunit referred to as Coulombs, Coulombs. Denoted by a funding C. So as with how wemeasure fixed in kilograms and we measure height in say, meters, we measure fee in Coulombs. And the word Coulumb isnamed after ~ the scientist the French Scientist, Charles Coulumb, that did a the majority of work in investigate the force between these fee particles. And also to offer you a senseof how large a Coulumb is, transforms out that the fee on one electron or a proton is a very, verysmall fraction of a Coulumb. Therefore if you were to look at atthe fee on an electron which us usually represent as e, it transforms out to it is in so small. Let's see, we compose it together 0.00, and there are so numerous zerosI can't create them all zero one six and also someother numbers, Coulombs. And also the variety of zeroes over below are 18. There space 18 zeroes in between. Simply goes to present you how little the fee on theelectron or the proton is. For this reason the electron has this muchcharge, yet it's negative. Proton likewise has the samevalue the the charge, however it's positive. For this reason they have the exact same values, but one has actually positive charge and also the other one has an unfavorable charge. And of course, due to the fact that it is so small we regularly like to represent thisin the clinical notation. So we will shift thisdecimal every the method to here. Now, when you create itas 1.6 x 10 come the power, now let's see just how many, how many times we have shifted it. To transition from right here tohere, we transition 18 times and then one extra shift,19 shifts to the right and also so we'll create it asnegative 19 end here. So, so plenty of Coulombs is the fee on an electron or a proton. Nelson's Coulomb is abrand new unit for us. It would be pretty if wecould acquire some sense for how large it is. As with how we have actually somesense for what a kilogram is or how big one meter is, it would certainly be good tohave some sense for what or how large a Coulumb would certainly be. Therefore to carry out that, here's howI prefer to think about it. Now that we recognize that the chargeon one electron or a proton is together a tiny number, because that electrons it would be negative, for protons it would certainly be positive. We could ask ourselves,how many, say electrons would comprise a totalof one Coulomb charge? You gain it. Therefore it's gonna it is in a substantial number due to the fact that charge on every electron is so tiny we require a the majority of electronsto consist of one Coulomb. Yet exactly how much, is the concern So let's think around this. Let's go under a tiny bit. And so here's the question. How numerous electrons together consist of a an adverse one Coulomb precious of charge? So, good idea to pause the video an initial and check out if you can tryto carry out this yourself. Making use of this information try to figure this the end yourself first. All right, let's carry out this. So to do this, we understand one electron, for this reason let's compose that down. We recognize one electron is precious a fee of 1.6 x 10 to the minus 19 Coulombs. And also since it's one electronwe're dealing with, it would certainly be negative. But I want one Coulombworth the charge, no this. For this reason to make this righthand next one Coulomb, I will certainly divide the right-hand side. Let's division the right-hand side by 1.6 x 10 come the minus 19. So the this will cancel andbecome an unfavorable one Coulomb. So right here you have to divideleft-hand side as well by 1.6 time 10 come the strength minus 19. For this reason on the left-hand side,we have actually one divided by 1.6. Let's bring in my calculatorand watch what that gives me. For this reason it'd be one separated by 1.6. That will certainly be 0.625. Therefore that will certainly be on theleft-hand side, 0.625 that's one divide by 1.6, and also this will end up being 10 x10 to the power plus 19, to add 19. And that so numerous electrons is tantamount to now a fee of negative one Coulomb. So to obtain one Coulumb precious of charge, we need so countless electrons, so many and of food we deserve to alsowrite it in appropriate note to be 6.25 x 10, tothe strength 18 electrons. We shifted one zero by get loan one 10. Therefore anyways, these many electrons together a huge number 10 come the 18 electrons, these many electrons together make up a fee of negative one Coulomb. And so as soon as I saw ask myself, how large is a Coulomb? I choose to think the it together one Coulumb is equal than to so many electrons. You take it so numerous electrons together, that itself represents what a Coulumb is. That's just how I favor to thinkabout what one Coulumb is. Therefore to summary what welearned in this video, is the unit because that electriccharge is Coulombs. We saw what the fee on theelectrons and the protons are. And we also saw that oneCoulomb, how big a Coulumb is. It's equal into so manyelectrons or so numerous protons.


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Because the protons and electrons have the very same value of charge. However one is positive, theother one is negative.