Question

Define specific resistance and state its SI unit.

Answer 1

Hint: in this question, we will first know the basics of resistance. Next we will study about the specific resistance and its S.I unit. Further, we will discuss the basics of a simple series circuit and also, about the ohm’s law, for our better understanding.

Complete answer:
As we know that the resistance is the property of material to oppose the flow of electric current passing through it.
Here, the specific resistance is defined as the resistance offered by a unit length and unit cross section of the substance to a current I when a voltage V is applied to it.
The S.I unit of specific resistance is Ohm meter.
Therefore, we get the required result.

Additional information:
According to the ohm’s law on constant temperature the current I passing through the conductor is directly proportional to the potential difference V across its ends
We should know that in a series circuit, the output current of the first resistor flows into the input of the second resistor; so, the current is the same in each resistor whereas in a parallel circuit, all of the resistors are on connected together on one side and all the leads on the other side are connected together.
In a circuit if the resistance is constant over a range of voltage, then I = V/R, can be used to predict the behavior of the material. This involves DC current and voltage, it is the same for the resistors. Further, a material obeys Ohm's law or does not obey; the resistance of the material can be described in terms of its bulk. The resistivity, and the resistance both, is temperature dependent. Over certain ranges of temperature, this temperature dependence can be predicted from resistance.

Note:
In series connection the resistances are directly added whereas in parallel connection resistance is added inversely. Internal resistance of a circuit refers to the opposition to the flow of current offered by the cells and batteries themselves thereby, resulting in the generation of heat. Internal resistance and resistance both are measured in Ohms.