![]() Let's bring in my calculatorĪnd see what that gives me. Left-hand side as well by 1.6 times 10 to the power minus 19. So that this will cancel andīecome negative one Coulomb. Let's divide the right-hand side by 1.6 x 10 to the minus 19. Hand side one Coulomb, I will divide the right-hand side. We're dealing with, it would be negative. We know one electron is worth a charge of 1.6 x 10 to the minus 19 Coulombs. So to do this, we know one electron, so let's write that down. Using this information try to figure this out yourself first. How many electrons together make up a negative one Coulomb worth of charge? So, great idea to pause the video first and see if you can try But exactly how much, is the question So let's think about this. So it's gonna be a huge number because charge on each electron is so tiny we need a lot of electrons How many, say electrons would make up a total On an electron or a proton is such a small number, for electrons it would be negative, for protons it would be positive. Have some sense for what or how big a Coulumb would be. Sense for what a kilogram is or how big one meter is, it would be great to It would be nice if weĬould get some sense for how big it is. Nelson's Coulomb is aīrand new unit for us. So, so many Coulombs is the charge on an electron or a proton. ![]() ![]() Here, we shift 18 times and then one extra shift,ġ9 shifts to the right and so we'll write it as Now, when you write itĪs 1.6 x 10 to the power, now let's see how many, how many times we have shifted it. So we will shift thisĭecimal all the way to here. And of course, since it is so small we often like to represent this So they have the same values, but one has positive charge and the other one has negative charge. So the electron has this muchĬharge, but it's negative. Just goes to show you how small the charge on theĮlectron or the proton is. And the number of zeroes over here are 18. I can't write them all zero one six and some Let's see, we write it as 0.00, and there are so many zeros The charge on an electron which we usually represent as e, it turns out to be so small. Of how big a Coulumb is, turns out that the charge on an electron or a proton is a very, very Named after the scientist the French Scientist, Charles Coulumb, who did a lot of work in investigating the force between these charged particles. Measure mass in kilograms and we measure height in say, meters, we measure charge in Coulombs. So the symbol for theĮlectric charge is q. In this video, we look at what the symbol and the unit for electric charge is. We call this "The Electric Force." And of course today we have discovered so many other particles that also possess this thing called less charge. Protons and electrons possess because of which they can attract and repel other protons and electrons. By convention, the c 2 is usually dropped, and masses quoted in GeV.Previous video we discussed what Electric Charge is. So, for example, the mass of the proton is 0.938 GeV/c 2, which makes the GeV/c 2 a very convenient unit (= 1.783 x 10 -27 kg). Now particle physicists use the electron volt, as a unit of energy too however, confusingly, they also use it as a unit of mass! They do this by using the famous E = mc 2 equation, so 1 eV – the unit of mass – is equal to 1 eV (the unit of energy) divided by c 2 (c is the speed of light). So, for example, the Lyman limit – which corresponds to the energy to just ionize an atom of hydrogen – is both 91.2 nm and 13.6 eV. ![]() Astronomers use electron volts to measure the energy of electromagnetic radiation, or photons, in the x-ray and gamma-ray wavebands of the electromagnetic spectrum, and also use electron volts to describe the difference in atomic or molecular energy states which give rise to ultraviolet, visual, or infrared lines, or limits. ![]()
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