# Ohmic and non ohmic conductors

This is important in designing electrical and electronic circuits in order ensure that the voltages and currents in the components stay within specs. An Ohmic conductor would have a linear relationship between the current and the voltage. With non-Ohmic conductors, the relationship is not linear. A good example of an Ohmic conductor is the resistor. Black-slon - CC 4.

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In his first paper published inOhm examines the decrease in the electromagnetic force produced by a wire as the length of the wire increased.

The paper deduced mathematical relationships based purely on the experimental evidence that Ohm had tabulated. The second paper certainly is the first step in a comprehensive theory which Ohm was able to give in his famous book published in the following year.

The book begins with the mathematical background necessary for an understanding of the rest of the work. We should remark here that such a mathematical background was necessary for even the leading German physicists to understand the work, for the emphasis at this time was on a non-mathematical approach to physics.

The relationship of a current passing through most materials is directly proportional to the potential difference applied across the material. However, his work was eventually recognised by the Royal Society with its award of the Copley Medal in He became a foreign member of the Royal Society inand in he became a full member of the Bavarian Academy.

In other words, where V is the voltage and I is the current; the above equation yields the proportionality constant R, which is the electrical resistance of the device. The law is strictly true only for resistors whose resistance does not depend on the applied voltage, which are called ohmic or ideal resistors or ohmic devices.

When the temperature of the metal increases, the collisions between electrons and atoms increase, so that when a substance heats up because of electricity flowing through it or by whatever heating processthe resistance will increase. To check whether a given device is ohmic or not, one plots V versus I and compares the graph to a straight line through the origin. Extending the theory of Georg Ohm, he generalized the equations describing current flow to the case of electrical conductors in three dimensions.

In further studies he demonstrated that current flows through a conductor at the speed of light.Ohm's Law is the linear proportionality between current and voltage that occurs for most conductors of electricity.

A graph of voltage against current is a straight line. The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current whichflows through it.

If the resistance is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.

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The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current whichflows through it. If the resistance is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.

Ohmic vs Non-Ohmic Conductors. Ohm’s law, discovered and named after Georg Ohm, states the relationship between voltage, current and resistance of a conductor.

Other definitions of Ohm “Ω “are as follows; If there is a potential difference of 1 volt between two ends of the conductor and the flowing current through it is 1Ampere, . In other words, where V is the voltage and I is the current; the above equation yields the proportionality constant R, which is the electrical resistance of the device.

The law is strictly true only for resistors whose resistance does not depend on the applied voltage, which are called ohmic or ideal resistors or ohmic devices.

High Voltage and Extra High Voltage Cables