Grade 12General Physics
Draw V - I graph for ohmic and non-ohmic materials. Give one example for each ?
2 Answers
Apoorva Arora
Let's begin with the Ohm's Law
It states that the amount of current (I) flowing through a material (say a wire) is directly proportional to the voltage (V) applied across its ends. Mathematically, it is given as
V ∝ I
or
V = RI
here R is a constant of proportionality also known as the resistance. So, the resistance of a material following the Ohm's Law will always stay constant for all values of external voltage applied.
Now, using this principle, we can distinguish materials as either being Ohmic or Non-Ohmic in nature. Such that,
Ohmic materialsfollow the Ohms' law as the resistance remains unaffected even if we change the applied voltage (which alters amount of current flowing).
The V-I graph in this case shows a linear trend, as follows
A few examples include Nickel, Copper etc.
Non-Ohmic materials, as the name suggests, do not obey the Ohm's Law in its strictest sense as the resistance varies with applied voltage.
The V-I graph in this case would show a gradual curved slope, as follows
Non-Ohmic materials, as the name suggests, do not obey the Ohm's Law in its strictest sense as the resistance varies with applied voltage.
The V-I graph in this case would show a gradual curved slope, as follows
A few examples include Thermistor, Diode etc.
Thanks and Regards
Apoorva Arora
IIT Roorkee
askIITians Faculty
Rishi Sharma
Dear Student,
Please find below the solution to your problem.
Ohmic conductors are conductors which obey ohms law. A good example of an Ohmic conductor is the resistor. The voltage drop across a resistor is directly correlated to the current that is flowing through it
Non-Ohmic conductors do not follow Ohms law and have their own characteristics. There are a number of examples of non-Ohmic conductors; including bulb filaments and semiconductors like diodes and transistors. Let’s take the diode. A diode provides a near constant voltage drop even if you vary the current, so it does not follow Ohm’s law. The opposite happens in a light bulb filament; even as you increase the voltage significantly, it only allows a certain amount of current to pass through
Thanks and Regards
Please find below the solution to your problem.
Ohmic conductors are conductors which obey ohms law. A good example of an Ohmic conductor is the resistor. The voltage drop across a resistor is directly correlated to the current that is flowing through it
Non-Ohmic conductors do not follow Ohms law and have their own characteristics. There are a number of examples of non-Ohmic conductors; including bulb filaments and semiconductors like diodes and transistors. Let’s take the diode. A diode provides a near constant voltage drop even if you vary the current, so it does not follow Ohm’s law. The opposite happens in a light bulb filament; even as you increase the voltage significantly, it only allows a certain amount of current to pass through
Thanks and Regards
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