Differentiale b/w ohmic and non-ohmic??
Answers
Answer:
The main difference between an Ohmic and a non-Ohmic conductor is whether they follow Ohm's law. 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.
First we have to understand the concept of ohms law and ideal conductor.
Ideal conductor :
It is a material whose resistance doesnot change with temperature , in ideal conductors the current is without lose energy .
Ohm's law:
Current flow through an ideal conductor , which is directly proportional to the potential difference and inversely proportional to the resistance.
Here “voltage” means potential difference .
Ohms law expressed as V = I ×R
Here v = voltage, i= current, r=resistance .
Ohmic substance:
Which substances are obeys ohms law , those substances are called as “ohmic sunstances".
In this substances current is directly proportional to the voltage .
Examples: copper wire , aluminium
Non ohmic substances:
Which substances do not obeys ohms ias, those are called it as “non ohmic substances"
Examples:transistors, vaccum tubes .
Differences:
In ohmic substances , voltage and current graph is linear , in non ohmic substances the graph is not a straight line.
In ohmic substances the graph is as shown above
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