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As temperature affects resistivity, the resistance of a conductor may change if its temperature is allowed to increase. For pure metal conductors, the resistance generally increases as the temperature increases.

Ohm's Law ('the current flowing along a conductor, at constant temperature, is directly proportional to the potential difference across that conductor') only applies when the resistance of the conductor is constant so, when verifying Ohm's Law, the temperature must be kept constant, in order to keep the resistance constant.

It should be pointed out that the ratio of voltage (U) to current (R) is called resistance (R), and the resistance of a circuit can be found from the equation, R = U/I whether Ohm's Law applies or not -but Ohm's Law itself only applies when the ratio is constant over a range of voltage variation.

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12y ago
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12y ago

Because the resistance of conducting materials vary (in different degree and sense) with temperature.

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Q: What is the significance of the constant temperature reference in ohms law?
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What is the main objection of ohm's law in measuring resistance?

Temperature. Ohms law is applicable to measure resistance of an element at constant temperature only.


Why is R Introduced in ohms law?

Ohms law in most simplest form states that for a given conductor at a constant temperature current and voltage are directly related. ie V proportional to I. To equate any terms we need a equality sign and in order to make it a equality relation we introduce a constant, resistance. It is an inherent property of the system that doesn't vary for given dimension and temperature.


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1 volt applied across one ohms Will conduct one Ampere


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(3 x 103) x (3 x 10-6) = 0.009 squared ohms ... a quantity with no physical significance


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Ohm's Law is valid for constant temperature because it assumes a fixed relationship between voltage, current, and resistance. Any changes in temperature can alter the resistance of the material, affecting the accuracy of the law. Additionally, Ohm's Law is only valid for constant pressure because pressure changes can affect the physical properties of the material, such as its conductivity, which can also impact the law's accuracy.


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