Question
Consider the following statement regarding Kelvin Double
Bridge. Statement (1): It is used for measuring resistance in the range of few ohms to several mega ohm. Statement (2): It provides high accuracy in the measurement of low resistance. Statement (3): It is modification of Wheatstone bridge circuit. Which of the statement is/are FALSE.Solution
The Kelvin Double Bridge is a modified form of the Wheatstone bridge, specially designed to measure very low resistances (in the range of micro-ohms to a few ohms) with high accuracy, by eliminating the effect of lead and contact resistances. It is not used for high resistance measurements . ● Statement (1): False → It is not meant for resistances up to mega-ohms; it is for very low resistances. ● Statement (2): True → It gives high accuracy in measuring low resistance. ● Statement (3): True → It is indeed a modification of the Wheatstone bridge.
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