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Current time:0:00Total duration:2:59

Video transcript

voltage is one of the most important quantities and ideas in electricity and in this video we're going to develop a intuitive feeling for what voltage means but it has to do with potential energy of electrical charges and that's what we're going to cover here is we're not going to do a derivation but we are going to do a intuitive description of what voltage means we're going to start with an analogy to gravity gravity and voltage are really similar ideas I'm going to draw a mountain here here's here's some mountainside with snow on it and I'm going to put a mass here here's a mass of some mass m and it was lifted up to the top of the hill somehow by a ski lift by a mountain climber something like that and if I put it on top of the Mount and I let it go the potential energy that it has is going to be dissipated as kinetic energy and that mass is going to roll down the hill to here and as it does it can do some work it can do some it can hit some trees let's draw a tree and it can run into a tree and knock that tree around it can hit a bear it can bounce off rocks all kinds of things so that's a mass rolling down a hill now if I draw this is a way to think about voltage think about voltage as being another mountaintop and this time we'll put a battery in here this is our battery this is what a battery does for us it actually builds our mountain the battery actually delivers electrons to the top of the hill so here's that here's an electron coming out of the battery terminal the negative battery terminal and if I release this it is going to roll down the hill and eventually it's going to return to the bottom side of the battery but the same thing this is the image you have in your head when we hook up a circuit along the way I can put in different circuit components like resistors or capacitors or anything like that and I can make this electron do work and bump into things as it goes down so the amount of voltage here is proportional to the height of this mountain a high voltage is a high mountain and a low voltages of low mountain the electrons are pushed out the top by the battery roll down to the bottom doing work along the way and this is where we do our circuit design that's what we're doing over here we buy batteries and we do our circuit design and study over here so this is this is a pretty good analogy for thinking about voltage as you begin to build your circuits see you next time