Virtual Labs

Low resistances are provided with four terminals

a: to eliminate the effect of thermo electric emfs Explanation

Explanation

b: to eliminate the effects of leads Explanation

Explanation

c: to fecilitate the connection of current and potential circuits Explanation

Explanation

d: in order that resistance value becomes definite irrespective of the nature of contacts at the current terminals Explanation

Explanation

In a kelvin double bridge two sets of readings are taken when measuring a low resistance , one with the current in one direction and other with direction of current reversed. This is done to

a: eliminate the effect of contact resistance Explanation

Explanation

b: eliminate the effect of thermo electric emfs Explanation

Explanation

c: eliminate the effect resistance of leads Explanation

Explanation

d: correct for changes in battery voltage Explanation

Explanation

To study the Kelvin Double Bridge for Low resistance measurement