Question

Kelvin's method to find resistance of galvanometer

Answer 1

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The Kelvin double bridge is the modification of the Wheatstone bridge and provides greatly increased accuracy in measurement of low value resistance. An understanding of the Kelvin bridge arrangement may be obtained by the study of the difficulties that arise in a Wheatstone bridge on account of the resistance of the leadsand the contact resistances while measuring low valued resistance.The Kelvin double bridge incorporates the idea of a second set of ratio arms-hence the name double bridge-and the use of four terminal resistors for the low resistance armsPRINCIPLE:The principle of wheat stone bridge is used in order to measure the unknown resistance of galvanometer while knowing the three resistances.

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