Question

Practical unit of resistance is ohm is equal to:

Answer 1

Hint: We know the resistance is the measure of the opposition to current flow in an electrical circuit. To solve this question, we will use the basics of ohm’s law. Also, we will study about the basic electrical circuit, for our better understanding.

Formula used:
$I = \dfrac{V}{R}$

Complete step-by-step answer:
As we know that according to the ohm’s law on constant temperature the current I pass through the conductor is directly proportional to the potential difference V across its ends.
$\eqalign{& I \propto V \cr
  & I = \dfrac{V}{R} \cr} $
Also, from above equation we know that one ohm resistance is given by:
$1\Omega = \dfrac{{1V}}{{1A}}$
Now, by substituting the value of potential and current in unit of emu, we get:
$1\Omega = \dfrac{{{{10}^8}emu}}{{\dfrac{1}{{10}}emu}}$
$\therefore 1\Omega = {10^9}emu$
Therefore, we get the required result of resistance in emu.

Additional Information:
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 resistor 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: There are limitations to the Ohm’s law. They are valid only for conductors not for all materials. We should also note that resistance is inversely proportional to the flow of current. The unit of resistance is ohm, named after the scientist. 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.