In this question we are asked to find what the potential difference is And what we are given is the work done to push four coulombs of charge across the filament of your bulb. So, great idea to pause the video and see if you can try this Find the potential differenceĪcross the filament. Push four coulombs of charge across the filament of a bulb. Understand what voltage is, or what potential difference is, if we understand the meaning of volts, we don't have to remember any formula, we can just logically So we need to do 15 joules of work to move five coulombs across. Joules per coulomb, this is three joules for every coulomb, but since we are moving five coulombs we multiply it by five, and that would be, the coulomb cancels, that would be 15 joules. So, one coulomb to moveįrom one point to another, three joules of work. So, with this data, pause the video and see if you can try andĪnswer this question yourself.
To move five coulombs, how much work do we need is the question. Is to move one coulomb we need to do three joules of work. We need to calculate the work done in moving five coulombs of charge What we already know Potential difference, let's see if we can answer the question. So now that we know what it means, what is the meaning of Much work needs to be done to move a coulomb from And this is telling us that three joules of work is needed to move every coulomb of chargeįrom one point to another, three joules per coulomb, that's what we mean by three volts. So we have seen in a previous video that volt really means joules per coulomb. And to calculate workĭone from this number we need to first understand The ends of the cell, across the terminals of the cell the potential difference is three volts. How much work is being done in moving five coulombs of charge. Find the work done in movingįive coulombs of charge across the cell. The potential difference between the two terminals
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