Ohmic or Non-Ohmic? - Reasoning Explained

  • Thread starter raman911
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In summary, the conversation is about whether the nichrome wire is ohmic or non-ohmic. It is determined that the wire is non-ohmic because the graph of the relationship between voltage and current is not linear. This contradicts Ohm's Law, which states that the two are directionally proportional and would result in a linear graph.
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  • #2
Does its resistance change?
 
  • #3
What we found: The graph is not a straight line which shows that the nichrome wire does not obey Ohm's Law, that is, it is non-ohmic.
 
  • #4
As the relationship is not linear, the graph is NON OHMIC.

Ohms law states that the Voltage (Potential Difference) and Current of a circuit are both DIRECTIONALLY PROPORTIONAL to each other - therefore a graph produced displaying the relationship between the two would be linear.

Hope this helps!
 
  • #5







Based on the graph provided, the relationship between voltage and current appears to be linear, indicating an Ohmic behavior. This means that the resistance of the material remains constant and the current is directly proportional to the voltage applied. This is commonly seen in metals and other conductive materials.

To further confirm this, we can calculate the resistance using Ohm's law (R=V/I). From the graph, we can see that for every increase in voltage of 1V, there is a corresponding increase in current of 0.2A. Therefore, the resistance would be 5Ω, which remains constant throughout the graph.

If the relationship between voltage and current were non-Ohmic, we would see a nonlinear curve on the graph, indicating a change in resistance as the voltage changes. This is commonly seen in semiconductors and other non-conductive materials.

In summary, the graph provided shows an Ohmic behavior due to its linear relationship between voltage and current, and a constant resistance throughout the graph.
 

What is the difference between Ohmic and Non-Ohmic materials?

Ohmic materials have a linear relationship between voltage and current, meaning their resistance remains constant regardless of the voltage applied. Non-Ohmic materials, on the other hand, have a non-linear relationship between voltage and current, meaning their resistance changes with the voltage applied.

How do Ohmic and Non-Ohmic materials behave in terms of electrical conductivity?

Ohmic materials have a high electrical conductivity, meaning they allow electricity to flow easily, while Non-Ohmic materials have a lower electrical conductivity due to their non-linear resistance.

What causes a material to be Ohmic or Non-Ohmic?

The atomic and molecular structure of a material determines whether it will behave as an Ohmic or Non-Ohmic material. In Ohmic materials, the atoms and molecules are arranged in a way that allows for a consistent flow of electrons, while in Non-Ohmic materials, the arrangement is more irregular, causing a non-linear resistance.

Can a material switch between being Ohmic and Non-Ohmic?

Yes, a material can switch between being Ohmic and Non-Ohmic depending on the voltage applied. At low voltages, it may behave as an Ohmic material, but at higher voltages, it may exhibit non-linear behavior and become Non-Ohmic.

How does the temperature affect the Ohmic or Non-Ohmic behavior of a material?

The temperature can also affect the Ohmic or Non-Ohmic behavior of a material. In some materials, an increase in temperature can cause a change in the atomic structure, leading to a change in their resistance and a switch from Ohmic to Non-Ohmic behavior.

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