Which graphs represent ohmic resistors

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Donate Login Sign up Search for courses, skills, and videos. Introduction to circuits and Ohm's law. Solved example: Ohms law. Practice: Ohm's law and resistance. Ohm's law graph verifying Ohm's law. Solved example: Ohm's law graph. Next lesson. Current timeTotal duration Google Classroom Facebook Twitter. Video transcript - [Presenter] Let's explore how we can practically verify whether any material obeys Ohm's law.

Now before we do that, let's quickly recall what Ohm's law is. Ohm's law says that if you take any material, like let's say, windings of a wire and if we apply a potential difference across the ends of that, so let's say the potential difference across the ends of this wire is V, and because of this, a current starts running over here, let's call that current as I.

Then Ohm's law says that V must equal I times R. Where R represents the resistance that the material offers to the flow of charges through that material. And we have talked in detail about this in a previous video, so if you need a refresher it will a great idea to go back and watch that video and then come back over here. And so the question is, if I have some material with me, how do I check, practically, whether this relationship, Ohm's law, whether it really holds true or not. So to do this, we need to first understand a little bit more about this thing called resistance.

You see, the resistance is a property of the material and its dimensions and something we'll talk more about in the future. What's important is that it does not depend on the values of voltage or current. 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 number shouldn't change.

In other words, in this equation, this number is a constant. This is a constant. And so, another way to look at this, is we could say if we divide this equation by I, we could say V divided by I should equal R, should be a constant. Should be a constant. So to check whether any material obeys Ohm's law, we need to check whether the ratio of voltage and current through that 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. If we triple the voltage, the current must also get tripled. Request OTP. Updated On: Share This Video Whatsapp. Text Solution.

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