1.

A DC ammeter has a resistance of 0.1 Ω and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance?(a) 0.010 Ω(b) 0.011 Ω(c) 0.025 Ω(d) 1.0 ΩI have been asked this question during a job interview.The query is from Advanced Miscellaneous Problems on Measurement of Resistance in section Measurement of Resistance of Electrical Measurements

Answer»

The correct option is (C) 0.025 Ω

Easy explanation: Rsh = \( \FRAC{R_m}{m-1}\)

Where, m is the MULTIPLICATION FACTOR = 500/100 = 5

∴ Rsh = 0.1/4 = 0.025 Ω.



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