A) what is the difference between ohmic conductor and non-ohmic conductor? Give one example each and draw their iv characteristic curves
Answers
Ohmic devices or conductors are those devices which follows Ohm’s Law and Non-Ohmic devices are those which don’t follow Ohm’s Law.
Ohm’s Law states that the voltage is directly proportional to current if the physical conditions remains constant, where the constant of proportionality is given by ‘ohm(R)’.
V=IR
Examples :
Ohmic device: Resistor
Non-Ohmic device: Diodes.
Answer:
Explanation:
Ohm’s law, discovered and named after Georg Ohm, states the relationship between voltage, current and resistance of a conductor. This is important in designing electrical and electronic circuits in order ensure that the voltages and currents in the components stay within specs. Just about any component that is capable of carrying a current is considered to be a conductor, it’s just a matter of whether the conductor is Ohmic or not. 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. The voltage drop across a resistor is directly correlated to the current that is flowing through it. But, this is only true when the resistor is kept within the temperature range that it is rated for. As more current flows through a resistor, it generates more and more heat. This heat, when it becomes excessive, can cause the resistor to become non-Ohmic and the resistance would also increase. Even ordinary wires are also considered as Ohmic conductors. Ordinary wires still have resistance but are often designed to be extremely low to minimize losses.