Question

Name the different methods of finding unknown resistance

Answer 1

well, there are many method in order to find the unknown resistance .Each method is unique in it's own way but are used for resistance in different range .
In order to findout the very low resistance( less than 1 ohm)  the methods like  Kelvin double bridge method as well as the  Potentiometer methods are effective. 

For medium range resistance:
1) substitution method (2) using Ohmmeter (3) Carey- Foster bridge method are used along with other methods

If you want to measure the high resistance  1) Megger method (2) Loss of charge method (3)  Meghom bridge method are the famous method to measure it.

Answer 2

We can classify the resistance in the following way :

Classification of Reistance :
low resistance=0.1ohm to 1 ohm

medium resistance =1ohm to low mega ohm

high resistance=0.1 megaohm to a higher range.

Different methods of finding Unknown resistance  are based on type of resistance used:

Methods for finding
 
Low resistance:
Kelvin double bridge
Ammeter -voltmeter 

Resistance For medium Resistance:
Ammeter -voltmeter method
Wheat stone bridge method
ohm meter method

Method for finding high Resistance:
Direct deflection method
loss of charge method
Megha Ohm bridge method