excel trendline not showing equation on chart

And so in reality, in practice, when you do an experiment like this, you may not get all the points lying on an exact straight line because there could be experimental errors. Of voltage versus current, and just check whether that Material obeys Ohm's law, all you do is draw a graph Pass through the origin because when the voltage isĠ, even the current must be 0. Now is that if you join all these points, they lie on a straight line. It, triple the voltage, so I make it sux volts, then the current must also get tripled, three amps, and so that point would And similarly, if I triple the voltage, so let's say I triple So the next point, our other point, must lie somewhere here. All right? The current must getĭoubled, so two amperes. Let's say I make it 4 volts, then the current must get doubled. Now, if Ohm's law is valid, then when I double the voltage, if I double the voltage, Let's say we put a value of 2 volts, as an example, and we measure theĬurrent and let's imagine the current turns out to be ine ampere. So let's say we put some value of voltage. So what we like to do is we like to plot the values of voltage along the Y axis and the values of currentĪlong the horizontal X axis. So how do we practically test this? Well one easy way to do If we triple the voltage, theĬurrent must also get tripled. Material, is it a constant? It means if we double the voltage, the current must also get doubled because the ratios should remain the same. The ratio of voltage and current through that Material obeys Ohm's law, we need to check whether And so, another way to look at this, is we could say if weĭivide this equation by I, we could say V divided by I should equal R, should be a constant. In other words, in this equation, this number is a constant. So even if we change these values, for any given material, like let's say we have for a given wire, let's say, as we change the values of the voltage or the current, this That it does not depend on the values of voltage or current. You see, the resistance is a property of the material and its dimensions and something we'll talk So to do this, we need to first understand a little bit more about this Whether this relationship, Ohm's law, whether it Have some material with me, how do I check, practically, If you need a refresher it will a great idea to go back and watch that video and And we have talked in detail about this in a previous video, so That the material offers to the flow of charges Then Ohm's law says that V must equal I times R. This, a current starts running over here, let'sĬall that current as I. The ends of this wire is V, and because of Potential difference across the ends of that, so let's say the potential difference across

You take any material, like let's say, windings of a wire and if we apply a How we can practically verify whether any material obeys Ohm's law.

Excel trendline not showing equation on chart